Ok stupid question time. The temperature during the Cretaceous was on average hotter than the 3.9C increase stated to halt photosynthesis. There was certainly photosynthesis going on then, how is that possible? Do we assume the plants had enough time to adapt to that new temperature, changing their photosynthetic machinery to work at higher temperatures than today?

we found that tropical forests can withstand up to a 3.9 ± 0.5 °C increase in air temperatures before a potential tipping point in metabolic function

Not that close, fortunately. There are tons of other terrible disasters that will strike before we reach this point.

We are already witnessing increased forest fires , the events sound like mass ectinction event ! Though quite sure humans will survive this ! At least the rich will !

• Received: 31 August 2021
• Accepted: 30 June 2023

So the research on this article is already 2 years old, but only now was it published…