We are now in the Suicene

The Holocene is the geological epoch that started approximately 11,650 years ago. The demarcation point between the Holocene and the preceding Pleistocene is the end of the last Glacial Period, in line with variations in the Earth's orbit. 

Anthropocene

Instead of going down as would be in line with changes in the Earth's orbit, temperatures and greenhouse gas levels over the past few thousands of years have kept going up as a result of activities by people. In other words, changes in the Earth's orbit were no longer the dominant force causing changes in temperature and greenhouse gas levels, instead, human activities had become more dominant. 

Start of the Anthropocene

It makes sense to name an epoch after the dominant force shaping its climate. An earlier analysis concludes that, from the year 3480 BC, emissions by people have been higher than the amount it takes to negate the natural trend for the temperature to fall. From 3480 BC, forcing due to activities by people was stronger than the natural fall in temperature that would have eventuated in the absence of such activities. This makes the year 3480 BC most significant as a climate marker, and it makes sense to regard this both as the base for the temperature rise from pre-industrial and as the start of the Anthropocene. 

End of the Anthropocene

At the Paris Agreement, adopted in 2015, nations pledged to limit the temperature rise to well below 2°C above pre-industrial levels, with efforts taken to limit it to 1.5°C above pre-industrial levels. The image below illustrates that, despite these pledges, these thresholds may already have been crossed. 

[ from earlier post, click on images to enlarge ]

The earlier analysis concludes that the rise from pre-industrial to 2020 could be as much as 2.29°C, which would mean that the thresholds set at the Paris Agreement have already been crossed and the rise from pre-industrial may well exceed 3°C soon, in turn effectively making 3°C the (new) threshold that should not be crossed, the more so since humans will likely go extinct with a 3°C rise, as illustrated by the image below, from an analysis discussed in an earlier post.

Humans are now functionally extinct

1. The situation is dire in many respects, including poor conditions of sea ice, levels of greenhouse gases in the atmosphere, extreme weather causing droughts, flooding and storms, land suffering from deforestation, desertification, groundwater depletion and increased salinity, and oceans suffering from ocean heat, oxygen depletion, acidification, stratification, etc. These are the conditions that we're already in now. 
   
   
2. On top of that, the outlook over the next few years is grim. Circumstances are making the situation even more dire, such as the emerging El Niño, a high peak in sunspots, the Tonga eruption that added a huge amount of water vapor to the atmosphere. Climate models often average out such circumstances, but over the next few years the peaks just seem to be piling up, while the world keeps expanding fossil fuel use and associated infrastructure that increases the Urban Heat Island Effect.
   
   
3. As a result, feedbacks look set to kick in with ever greater ferocity, while developments such as crossing of tipping points could take place with the potential to drive humans (and many other species) into extinction wirhin years. The temperature on land on the Northern Hemisphere may rise so strongly that much traffic, transport and industrial activity could suddenly grind to a halt, resulting in a reduction in cooling aerosols that are now masking the full wrath of global heating. Temperatures could additionally rise due to an increase in warming aerosols and gases as a result of more biomass and waste burning and forest fires.
   
   
4. As a final straw breaking the camel's back, the world keeps appointing omnicidal maniacs who act in conflict with best-available scientific analysis including warnings that humans will likely go fully extinct with a 3°C rise.

The Suicine

As we keep appointing omnicidal maniacs who act in conflict with best-available scientific analysis, we are now facing a temperature rise that looks set to drive humans into extinction. Humans are now functionally extinct, and another name change is in order. Indeed, we are now in the Suicene. 

Conclusion

In conclusion, we have left the Anthropocene. We are now functionally extinct and we look set to drag most, if not all life on Earth into extinction with us, as we keep appointing omnicidal maniacs who act in conflict with best-available scientific analysis. We are now in the Suicene.

In the video below, Sandy discusses the situation.