Monday, June 10, 2019

When Will We Die?


A rise of more than 5°C could happen within a decade, possibly by 2026. Humans will likely go extinct with a 3°C rise and most life on Earth will disappear with a 5°C rise. In the light of this, we should act with integrity.

When will we die?

The outlook for people living now is that they will die before the end of the century. After all, even in more developed regions, people statistically die at an age below 75 years, as the image on the right illustrates.

The image calls up questions regarding possible shortening of life expectancy due to global heating.

A 2018 study by Strona & Bradshaw indicates that most life on Earth will disappear with a 5°C rise (see box on the right).

The first question therefore is whether and how fast such a rise could eventuate.

Furthermore, global heating projections for the year 2100 may seem rather irrelevant to many people, as they do not expect to be alive by the year 2100.

A second question therefore is what makes most sense, focusing on the year 2100, or on how much temperatures could rise over the next decade.

Clouds tipping point

A recent study points at a tipping point of 1,200 ppm CO₂e when marine stratus clouds start to disappear, resulting in an additional global heating of eight degrees Celsius (8°C or 14.4°F).

In other words, such a rise from clouds feedback would clearly suffice to cause extinction of most life on Earth.

Could this tipping point be crossed soon?

At its high-end, the A1F1 scenario used by the IPCC reaches a CO₂e level of 1550 ppm by the year 2100 (see screenshot below).

As discussed, the year 2100 is rather distant. The question is, could this 1,200 ppm CO₂e tipping point be crossed earlier, say, within one decade?

On May 15, 2019, scripps.ucsd.edu recorded a carbon dioxide level of 415.7 ppm at Mauna Loa, Hawaii. NOAA recorded a methane level of 1.867 ppm for December 2018. As shown at the FAQ page, methane is 150 times as potent as a greenhouse gas over the next ten years compared to carbon dioxide. Accordingly, this 1.867 ppm of methane causes global heating of 280.05 ppm CO₂e.

Seafloor methane

Imagine a burst of methane erupting from the seafloor of the Arctic Ocean that would add an amount of methane to the atmosphere equal to twice the methane that is already there. Twice the 1.867 ppm of methane is 3.734 ppm, which at 150 times the potency of carbon dioxide translates into a CO₂e of 560.1 ppm.

Adding this to the current levels of carbon dioxide and methane results in a level of 1255.85 ppm CO₂e, well exceeding the 1,200 ppm CO₂e tipping point and thus triggering the extra 8°C rise.



Above image was created with content from a recent paper by Natalia Shakhova et al. It shows that the outlook is much more grim than many people realize.


Above image illustrates the danger, as an ominous sign of what's on the way. Methane levels as high as 2.975 ppm were recorded on June 11, 2019, at 469 mb. A peak this high is likely to have originated from the seafloor.


Above image shows a solid-colored magenta area over the ESAS that afternoon, further indicating that large amounts of methane did erupt earlier that day from destabilizing sediments in the ESAS.

Koalas declared functionally extinct

The Australian Koala Foundation has declared Koalas "functionally extinct". While there still are some 80,000 Koalas left, it is unlikely that Koalas will be able to escape full extinction for long.

Climate change-driven droughts and heat waves are causing dehydration and heat stress, leading to organ failure and premature death.

A rapid temperature rise could make virtually all species on Earth go extinct. As the above-mentioned study points out, even the most robust lifeforms on Earth will likely disappear with a 5°C rise, as species on which they depend will die.

Near Term Human Extinction

For mammals, which depend on a lot of other species, extinction is likely to come earlier.  When looking at near-term human extinction, a 3°C rise from preindustrial will likely suffice to cause extinction.

In 2019, the global temperature could already be 1.85°C above preindustrial and a rapid temperature rise could take place over the next few years.

A lot of good action is possible, as described in the Climate Plan, which offers the greatest amount of flexibility in local implementation, within the constraints of the need to act on climate change as acknowledged, e.g. at the Paris Agreement.

Nonetheless, humans likely are already functionally extinct, as is most life on Earth. This may come as a surprise to many people, but that shouldn't stop people from doing the right thing.

The above image reflects the joint CO₂e impact of carbon dioxide and methane. In addition, there is the impact of further greenhouse gases, such as nitrous oxide and CFCs, as described in a recent post. There are more warming elements, such as albedo loss associated with the decline of the snow and ice cover. These warming elements could jointly push up the temperature rise to some 10°C above preindustrial, while the clouds feedback could add a further 8°C on top of that.

Sulfates do have a cooling effect, but this effect may fall away as society grinds to a halt and stops co-emitting sulfates alongside other emissions in the process of burning fuel, as Guy McPherson has pointed out repeatedly, e.g. in this recent post.

In the video below, recorded at the University of Alaska-Fairbanks on 4 April 2019, Guy McPherson explains how loss of habitat can lead to extinction of species and how global heating can lead to extinction of virtually all life on Earth.


Added below is a video edited by Tim Bob of Guy McPherson talking in Juneau, Alaska, in April, 2019.




Links

• United Nations, world population prospects, 2017, Life expectancy
https://www.un.org/en/development/desa/population/publications/pdf/popfacts/PopFacts_2017-9.pdf
https://www.un.org/development/desa/publications/world-population-prospects-the-2017-revision.html

• Intergovernmental Panel on Climate Change (IPCC) AR4 (2007), Working Group I: The Physical Science Basis
https://archive.ipcc.ch/publications_and_data/ar4/wg1/en/spmsspm-projections-of.html

• Co-extinctions annihilate planetary life during extreme environmental change, by Giovanni Strona and Corey Bradshaw (2018)
https://www.nature.com/articles/s41598-018-35068-1

• Climate Plan
https://arctic-news.blogspot.com/p/climateplan.html

• Extinction
https://arctic-news.blogspot.com/p/extinction.html

• Possible climate transitions from breakup of stratocumulus decks under greenhouse warming, by Tapio Schneider et al.
https://www.nature.com/articles/s41561-019-0310-1

• FAQ #13: What is the global warming potential of methane?
https://arctic-news.blogspot.com/p/faq.html#13

• Methane hydrates
https://methane-hydrates.blogspot.com/2013/04/methane-hydrates.html

• Methane, measured by the Infrared Atmospheric Sounding Interferometer (IASI) residing on the MetOp polar orbiting satellites
https://www.ospo.noaa.gov/Products/atmosphere/soundings/iasi

• A rise of 18°C or 32.4°F by 2026?
https://arctic-news.blogspot.com/2019/02/a-rise-of-18c-or-324f-by-2026.html

• Greenhouse Gas Levels Keep Accelerating
https://arctic-news.blogspot.com/2019/05/greenhouse-gas-levels-keep-accelerating.html

• Stronger Extinction Alert
https://arctic-news.blogspot.com/2019/03/stronger-extinction-alert.html

• Understanding the Permafrost–Hydrate System and Associated Methane Releases in the East Siberian Arctic Shelf, by Natalia Shakhova, Igor Semiletov and Evgeny Chuvilin
https://www.mdpi.com/2076-3263/9/6/251

• Guy McPherson at the University of Alaska-Fairbanks, April 2019
https://guymcpherson.com/2019/04/the-first-of-two-presentations-at-the-university-of-alaska-fairbanks/

• Guy McPherson in Juneau, Alaska, April 2019
https://guymcpherson.com/2019/05/presentation-in-juneau-alaska

• Seven Distinct Paths to Loss of Habitat for Humans, by Guy McPherson
https://weeklyhubris.com/seven-distinct-paths-to-loss-of-habitat-for-humans


Koalas

Koala habitat 1788 versus 2018
From: savethekoala.com
https://www.savethekoala.com/our-work/act-or-axe

• A report claims koalas are ‘functionally extinct’ – but what does that mean?
https://theconversation.com/a-report-claims-koalas-are-functionally-extinct-but-what-does-that-mean-116665

• Australian Koala Foundation calls on the new Prime Minister to protect the Koala
https://www.savethekoala.com/sites/savethekoala.com/files/uploads/AKF_press_release_10_may_2019.pdf

• Koalas become 'Functionally Extinct' in Australia with just 80,000 left
https://www.ecowatch.com/koalas-functionally-extinct-australia-2637183484.html

• Koalas declared “functionally extinct”
https://inhabitat.com/koalas-declared-functionally-extinct

• Why the Heck Do So Many Koalas Have Chlamydia?
https://www.livescience.com/62517-how-koalas-get-chlamydia.html



Saturday, June 1, 2019

Climate Plan

What we're witnessing is more than a climate crisis, we're facing climate catastrophe and the outlook is grim. We're already in the Sixth Mass Extinction event and we're facing a potential global temperature rise of 18°C or 32.4°F by 2026. Merely declaring a climate emergency is not enough.

[ from the post A rise of 18°C or 32.4°F by 2026? ]
The Climate Plan advocates measures that can be taken in efforts to improve the situation regarding the climate, as well as regarding the health, prospects and wellbeing of people and life in general. These measures can and should be implemented immediately, in line with the current climate crisis.


Seventeen measures for immediate implementation

1. FOSSIL FUEL - Ban the use of coal and natural gas for heating, cooking and generating electricity. Stop supplying natural gas from utilities over pipelines. Ban sales of natural gas bottles. Use rationing of electricity supply from the grid to overcome bottlenecks in supply, until sufficient clean, renewable electricity can fully supply demand over the grid.

2. NUCLEAR POWER - Stop nuclear power plants from continuing to operate and start decommissioning existing plants. Study options for treating and storing waste from such plants.

3. WOOD AND BIOFUEL - Progressively ban the use of wood and other biomass for generating power, for driving vehicles or for other energy-related purposes. Impose fees on sales of biofuel, while using revenues to fund pyrolysis of biowaste and on return of the resulting biochar to the soil locally. Ban sales and installation of new woodburners. Ban sales or supply of firewood, woodchips, briquets, charcoal, etc. Impose annual fees through local rates on real estate that contain existing woodburners, open fireplaces, and traditional ovens and furnaces that use wood, while using revenues to fund rebates on local sales of clean electric alternatives such as heat pumps.

4. ROAD AND RAIL VEHICLES - Progressively electrify all trains and rail traffic, by imposing fees on trains that run on fossil fuel, while using revenues to fund conversion to or purchase of new electric trains. Progressively ban the use of vehicles with internal combustion in cities, first for one day in the week, then for two days a week, etc. Add fees to annual registration of vehicles with internal combustion engines, and use the revenues to fund rebates on registration of electric vehicles. Progressively close petrol stations and ban sales of products such as gas, diesel, petrol and further fossil fuel. Add fees to sales of fossil fuel and use revenues to fund rebates on clean public transport locally. Ensure there is public access to financial records. Set standards to reduce unnecessary vehicle noise, while ensuring sufficient sound is generated to warn people and wildlife.

5. AVIATION - Progressively ban aviation where flights are powered by jet fuel and other fossil fuel and biofuel. Impose fees on sales of such fuel and use revenues to fund rebates on electric airplanes that can take off and land on rooftops. Similarly, add fees to flights entering and leaving airports by airplanes using fossil fuel, while using revenues to fund electric airplanes that can take off and land on rooftops.

6. SHIPPING - Progressively prohibit use of bunker fuel and other fossil fuel in shipping. Impose fees on sales of bunker fuel, with revenues used to fund batteries and hydrogen fuel cells to replace traditional engines in ships. Impose fees on shipping of fossil fuel, with revenues used to clean up waterways and support wildlife conservation.

7. URBAN WASTE - Progressively make that zero % waste leaves each city, neither by road or boat transport nor through the sky, soil or waterways. Make that waste will be processed within each city, preferably pyrolyzed with biochar and nutrients returned to soils. Add sensors to rubbish bins and garbage collection trucks to ensure that no toxic products are disposed off, unless through collection points that ensure proper processing.

8. PLASTIC - Ensure that no plastic (or plastic parts) will be sold without permit and without fees high enough to ensure return of such items to approved collection points for safe disposal and processing. Ban single-use plastic, such as for packaging, drinking, etc.

9. DIET - Progressively ban sales of livestock products, unless supplied for medical purposes if no alternatives are available. Add fees to sales of livestock products, with revenues used to fund rebates on soil and water supplements that contain biochar and olivine sand in rural areas. In coastal areas, use revenues to assist enhanced weathering in waterways. Stop using antibiotics and hormones to stimulate growth in animals. Stop using crop to feed animals, unless for sales of petfood to pets held with a permit. Add fees on sales of products that have carbon dioxide, sugar, salt, flavors or coloring added, with revenues used to promote vegan-organic diet.

10. AGRICULTURE - Add fees on sales of nitrogen fertilizers and use revenues to fund rebates on biochar and enhanced weather in oceans.

11. WILDLIFE CONSERVATION - Ban chemical pesticides. Remove walls and fences that stop wildlife. Provide ways for wildlife to cross roads and highways. Set aside progressively increasing areas where no urban, agricultural, industrial development is allowed. Move existing buildings, agriculture and industries from such areas. Fund progress through annual fees imposed on real estate in areas zones for industrial, urban and agricultural development.

12. CONSTRUCTION - Add fees on sales of Portland cement, with revenues used to fund carbon-negative contruction material used locally. Fees must be high enough to progressively phase out use of Portland cement.

13. AGRICULTURE AND FORESTRY - Prohibit dumping of agricultural and other waste in landfalls, prohibit burning of waste in open fires. Prohibit cutting down large trees without permits. Where permits are supplied, add fees to minimize deforestation, while using revenues to support reforestation and afforestation. Ensure that biowaste gets pyrolyzed, with the biochar returned to the soil locally. Add fees on local rates where soil loses carbon content, with revenues used to fund rebates where soil carbon content increases, such as when biochar and olivine sand are added or when new trees are planted.

14. COOLING - Ban sales of new air-conditioners, fridges and freezers that work with gases. Impose annually rising fees on existing items, while using the revenues from the annual fees to fund rebates on solid state products, including heat pumps.

15. INDUSTRY - Ban the use of cleaning, solvents and other products that result in further addition of greenhouse gases.

16. UNIVERSITIES - Encourage further study in the effectiveness of measures in all above areas. Compare what happens locally with what in other areas, to ensure the most effective policy tools are used locally to facilitate the necessary transitions. Government grants are to be given to studies that sufficiently care about above points.

17. FURTHER ACTION - Further lines of action will be needed to hold back the temperature rise. Some action requires further research and U.N. supervision. Some other action has low risk and, due to the urgency to keep temperatures down, testing and R&D should commence immediately. This applies in particular to ways to reduce overheating of the Arctic.

Examples of such measures are Marine Cloud Brightening off the east coast of North America, in efforts to cool the waters entering the Arctic Ocean. Proposals that need further study are the use of icebreakers during the northern Fall and Winter, to enable more heat to escape from the Arctic Ocean, thus reducing the risk of ocean heat destabilizing methane hydrates at the seafloor of the Arctic Ocean. That risk is high from late September when the sea ice starts closing off the Arctic Ocean, thus making it difficult for ocean heat to escape, while warm water is still being carried into the Arctic Ocean from the Atlantic Ocean. Denis Bonnelle has proposed to use icebreakers that travel in parallel and are interconnected to also clear the ice in between them.

While implementation of some of these lines of action requires U.N. supervision, much of the proposed action can readily be implemented locally without delay and the Climate Plan prefers speedy local implementation, with communities deciding what works best locally, provided that a community does take sufficient action to achieve the necessary dramatic reductions in each type of pollution, in line with the Paris Agreement to avoid a large temperature rise. Examples of implementation of some of these lines of action are depicted in the image below, showing examples of how progress can be achieved through local feebates.

The overview below also includes further possible action that could be considered. Importantly, the situation is that dire that even if all possible action as described is taken, this constitutes no guarantee that any humans will survive the coming decades.


The image below depicts how the above-mentioned measures line up in response to the threat.


In conclusion, the technologies and policy instruments are ready for implementation, so let's stop delaying what's needed so desperately, now is the time for comprehensive and effective action!

Wednesday, May 1, 2019

Greenhouse Gas Levels Keep Accelerating

Carbon Dioxide


Weekly CO₂ (carbon dioxide) levels at Mauna Loa, Hawaii, in May, 2019, reached 415.39 ppm, as above image shows. An ominous trendline points at 420 ppm in 2020.


The daily average CO₂ level recorded by NOAA at Mauna Loa, Hawaii, on May 15, 2019, was 415.64 ppm, as above image shows. The image below also shows hourly average levels from April 15, 2019, to May 15, 2019.


Current CO₂ levels far exceed levels that were common during the past 800,000 years, as the image below shows. CO₂ levels moved between roughly 180 and 280 ppm, while the temperature went up and down by some 10°C or 18°F.


The daily average CO₂ level recorded by scripps.ucsd.edu at Mauna Loa, Hawaii, on May 13, 2019, was 415.5 ppm and the May 15, 2019, level was 415.7 ppm. On May 14, 2019, one hourly average exceeded 417 ppm.


The situation is dire

This level of 417 ppm is 139 ppm above the CO₂ level in the year 1750 and more than 157 ppm above what the CO₂ level would have been if levels had followed a natural trend. As shown by the inset (from Ruddiman et al.) in above image, a natural trend points at levels below 260 ppm.

Furthermore, methane levels are rising even faster than CO₂ levels. While CO₂ levels did rise by 146% since 1750, methane levels did rise by 257% since that time and there is much potential for an even faster rise in methane levels due to seafloor hydrate releases. Levels of nitrous oxide also keep rising rapidly.

Such a rise in greenhouse gas levels has historically corresponded with more than 10°C or 18°F of warming, when looking at greenhouse gas levels and temperatures over the past 800,000 years, as illustrated by the image below.


Given that a 100 ppm rise in CO₂ did historically cause temperatures to rise by 10°C or 18°F, how much warming would be in line with a 157 ppm CO₂ and how fast could such a rise unfold?

A temperature of 10°C or 18° above 1750 seems in line with such high greenhouse gas levels. This is illustrated by above graph, based on 420,000 years of ice core data from Vostok, Antarctica, and as the post What Does Abrupt Climate Change Look Like? describes.


Why isn't it much warmer now? Why hasn't such a rise happened yet? Oceans and ice are still holding off such a rise, by absorbing huge amounts of warming. Of 1993-2003 warming, 95.5% was absorbed by oceans and ice. However, ocean stratification and ice loss are making the atmosphere take up more and more heat.

There are further warming elements, in addition to the accelerating rise in greenhouse gas levels. Mentioned above is the loss of the snow and ice cover. The domino effect is a popular way to demonstrate a chain reaction. It is typically sequential and typically uses dominoes that are equal in size. A chain reaction can be achieved with solid dominoes each as much as 1.5 times larger than the previous one. The exponential function is discussed in the video below by Guy McPherson. Rather than following a linear order, warming elements can be self-reinforcing feedback loops and can influence each other in ways that multiply (rather than pass on) their impact, which can speed up the temperature rise exponentially.

So, how fast and by how much could temperatures rise? As oceans and ice are taking up ever less heat, rapid warming of the lower troposphere could occur very soon. When including the joint impact of all warming elements, as described in a recent post, abrupt climate change could result in a rise of as much as 18°C or 32.4°F by 2026. This could cause most life on Earth (including humans) to go extinct within years.

Methane

Next to carbon dioxide, there are further greenhouse gases. Methane is important, because of its high short-term potency as a greenhouse gas and because methane levels in the atmosphere have hugely risen since 1750, and especially recently, as illustrated by the image on the right.

Carbon dioxide (CO₂), methane (CH₄) and nitrous oxide (N₂O) levels in the atmosphere in 2017 were, respectively, 257%, 146% and 122% their 1750 levels.

A recent study by Turetsky et al. concludes that, since sudden collapse releases more carbon per square metre because it disrupts stockpiles deep in frozen layers, and since abrupt thawing releases more methane than gradual thawing does, the impact of thawing permafrost on Earth’s climate could be twice that expected from current models.

As said, there also is a huge and growing danger of large abrupt methane releases from clathrates contained in sediments at the seafloor of the Arctic Ocean.

As illustrated by the image below, methane levels are rising and this rise is accelerating.


The graph shows July 1983 through December 2018 monthly global methane means at sea level, with added trend. Higher methane means can occur at higher altitude than at sea level. On Sep 3, 2018, daily methane means as high as 1905 ppb were recorded at 307 mb, an altitude at which some of the strongest growth in methane has occurred, as discussed in earlier posts such as this one.

The recent rise in methane is the more worrying in the light of recent research that calculates that methane's radiative forcing is about 25% higher than reported in IPCC AR5, implying that methane's GWP (global warming potential) over 10 years may be well over 150 times as much as CO₂.

Nitrous Oxide

Next to carbon dioxide and methane, there are further greenhouse gases, of which nitrous oxide is particularly important. Nitrous oxide is up to 300 times as potent as a greenhouse gas as carbon dioxide and has a lifetime of 121 years. Several recent studies point at the danger of huge releases of nitrous oxide from permafrost.

According to a 2017 study by Voigt et al., Arctic permafrost contains vast amounts of nitrogen (more than 67 billion tons). Warming of the Arctic permafrost is accelerating, causing rapid thaw of permafrost soils, and this now threatens to cause huge releases of nitrous oxide to the atmosphere. The study concluded that nitrous oxide emissions in the Arctic are likely substantial and underestimated, and show high potential to increase with permafrost thaw.

In the video below, Paul Beckwith discusses nitrous oxide.


In the video below, Paul Beckwith discusses the recent study by Wilkerson et al.


The study by Wilkerson et al. shows that nitrous oxide emissions from thawing Alaskan permafrost are about twelve times higher than previously assumed. A 2018 study by Yang et al. points at the danger of large nitrous oxide releases from thawing permafrost in Tibet. Even more nitrous oxide could be released from Antarctica. The danger is illustrated by the image below, which shows that massive amounts of nitrous oxide were recorded over Antarctica on April 29, 2019.


Depletion of the Ozone Layer

In addition to being a potent greenhouse gas, nitrous oxide is also an ozone depleting substance (ODS). As the left panel of the image below shows, growth in the levels of chlorofluorocarbons (CFCs) has slowed over the years, yet their impact will continue for a long time, given their long atmospheric lifetime (55 years for CFC-11 and 140 years for CFC-12). Since nitrous oxide levels continue to increase in the atmosphere, while the impact of CFC-11 and CFC-12 is slowly decreasing over time, the impact (as an ODS) of nitrous oxide has relatively grown, as the right panel of the image below shows.

[ from an earlier post ]
James Anderson, co-recipient of the 1995 Nobel Prize in chemistry for his work on ozone depletion, said in 2018 that "we have five years to save ourselves from climate change".

Comprehensive Action

In conclusion, while it's important to reduce emissions of all greenhouse gases, reducing emissions of methane and nitrous oxide is particularly important. To both reduce polluting emissions and to remove greenhouse gases from the atmosphere and oceans, the Climate Plan recommends feebates as depicted in the image below. As the image also mentions, further lines of action will be needed to avoid a rapid rise in temperature.

[ from an earlier post ]
Meanwhile, Arctic sea ice reached a new record low for April, as illustrated by the NSIDC image below.

In the video below, Guy McPherson describes what threatens to eventuate soon. This is an edit of the April 22, 2019, video in which Guy McPherson was interviewed by Peter B. Collins for the community television station in Marin County, California.


In the video below, Guy McPherson gives a presentation at the Center for Spiritual Living, in Chico, April 28, 2019.


The situation is dire and calls for comprehensive and effective action as described in the Climate Plan.


Links

• Climate Plan
https://arctic-news.blogspot.com/p/climateplan.html

• Permafrost collapse is accelerating carbon release, by Merritt Turetsky et al. (30 April 2019)
https://www.nature.com/articles/d41586-019-01313-4

• Permafrost nitrous oxide emissions observed on a landscape scale using the airborne eddy-covariance method, by Jordan Wilkerson et al. (April 3, 2019)
https://www.atmos-chem-phys.net/19/4257/2019/

• Can natural or anthropogenic explanations of late-Holocene CO2 and CH4 increases be falsified?, by William Ruddiman et al. (2011)
https://journals.sagepub.com/doi/10.1177/0959683610387172

• Radiative forcing of carbon dioxide, methane, and nitrous oxide: A significant revision of the methane radiative forcing, by Etminan et al. (2016)https://agupubs.onlinelibrary.wiley.com/doi/full/10.1002/2016GL071930

• Magnitude and Pathways of Increased Nitrous Oxide Emissions from Uplands Following Permafrost Thaw, by Guibiao Yang et al. (July 9, 2018)
https://pubs.acs.org/doi/10.1021/acs.est.8b02271

• Increased nitrous oxide emissions from Arctic peatlands after permafrost thaw, by Carolina Voigt et al.
https://www.pnas.org/content/early/2017/05/23/1702902114

• We Have Five Years To Save Ourselves From Climate Change, Harvard Scientist Says - James Anderson (January 15, 2018)
https://www.forbes.com/sites/jeffmcmahon/2018/01/15/carbon-pollution-has-shoved-the-climate-backward-at-least-12-million-years-harvard-scientist-says/

• A rise of 18°C or 32.4°F by 2026?
https://arctic-news.blogspot.com/2019/02/a-rise-of-18c-or-324f-by-2026.html

• Care for the Ozone Layer
https://arctic-news.blogspot.com/2019/01/care-for-the-ozone-layer.html

• What Does Runaway Warming Look Like?
https://arctic-news.blogspot.com/2018/10/what-does-runaway-warming-look-like.html

• Rapid ice loss in early April leads to new record low - NSIDC
https://nsidc.org/arcticseaicenews/2019/05/rapid-ice-loss-in-early-april-leads-to-new-record-low/



Wednesday, April 17, 2019

How long do we have?

The March 2019 temperature is in line with an earlier analysis that 2019 could be 1.85°C warmer than preindustrial and that a rapid temperature rise could take place soon, as illustrated by the image below.


A catastrophe of unimaginable proportions is unfolding. Life is disappearing from Earth and all life could be gone within a decade. At 5°C of warming, most life on Earth will have disappeared. When looking at near-term human extinction, 3°C will likely suffice. Study after study is showing the size of the threat, yet many people seem out to hide what we're facing.

Above image asks 'How long do we have?' The image is created with NASA LOTI data, adjusted 0.78°C to reflect a 1750 baseline, ocean air temperature and higher polar anomaly. Trends are added based on 1880-2019 (purple) and 2000-2019 data (red). The long-term purple trend points at 2025 as the year when 3°C rise from preindustrial could be crossed, while the red trend that focuses on short-term events shows how a 3°C rise from preindustrial could be reached as early as in 2020.

The chart below shows elements contributing to the warming, adding up to a rise of as much as 18°C by 2026.

[ from an earlier post ]
The situation is dire and calls for comprehensive and effective action, as described at the Climate Plan.


If we accept that crimes against humanity include climate crimes, then politicians who inadequately act on the unfolding climate catastrophe are committing crimes against humanity and they should be brought before the International Criminal Court in The Hague, the Netherlands.




Links

• Co-extinctions annihilate planetary life during extreme environmental change, by Giovanni Strona and Corey Bradshaw (2018)
https://www.nature.com/articles/s41598-018-35068-1

• How much warming have humans caused?
https://arctic-news.blogspot.com/2016/05/how-much-warming-have-humans-caused.html

• Extinction
https://arctic-news.blogspot.com/p/extinction.html

• A rise of 18°C or 32.4°F by 2026?
https://arctic-news.blogspot.com/2019/02/a-rise-of-18c-or-324f-by-2026.html

• Stronger Extinction Alert
https://arctic-news.blogspot.com/2019/03/stronger-extinction-alert.html

• Climate Plan
https://arctic-news.blogspot.com/p/climateplan.html