只能进不能退的地步,碳排放到底意味着什么?- 江南体育网页版- - - - -地球科学堆江南电子竞技平台栈交换 最近30从www.hoelymoley.com 2023 - 07 - 07 - t17:33:05z //www.hoelymoley.com/feeds/question/24331 https://creativecommons.org/licenses/by-sa/4.0/rdf //www.hoelymoley.com/q/24331 2 只能进不能退的地步,碳排放到底意味着什么? 该死的蔬菜 //www.hoelymoley.com/users/27645 2022 - 09 - 17 - t04:08:09z 2022 - 09 - 17 - t18:44:21z

I think I have heard that if the carbon emission raises a small amount above the current, it would be "point of no return". I heard it a long time ago, so I just searched Google and the top article says "irreversible damage".

But when I searched Google for a graph of historic CO2 levels, there was something like the one below. Granted that this was not the top search result (the top one was not continuous), but if this graph is correct, the CO2 level has been historically much higher than now. If there is any irreversible damage, won't that have already happened? And the CO2 level seems to be able to go down once it has risen, so it does not seem that the current CO2 level cannot get lowered once a certain level is reached.

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//www.hoelymoley.com/questions/24331/-/24332 # 24332 3 答案由alex_danielssen临界点为碳排放到底意味着什么? alex_danielssen //www.hoelymoley.com/users/14348 2022 - 09 - 17 - t18:44:21z 2022 - 09 - 17 - t18:44:21z < p >其时间尺度的问题。是的,碳浓度更高的过去。我们也有行星灭绝事件造成了很大一部分的地球生物。

The 'point of no return' speaks to the idea that, before that point, we are able to return to a pre-anthropogenic climate which we are familiar with and is able to continue to support us (through agriculture, predictable drought & flood recurrance).

Conversely, once we pass that point, there are feedback loops that will cause the climate to move towards a new 'stable' state which we are unfamiliar with and may not support many of the things that have made our lives easy.

That's not to say "the earth" will be irreperably damaged, but rather that the time scales involved are not practical, and we will have to deal with some problematic climate change effects.

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