I used to run a site called extinction.fyi which documented the climate emergency. This definitely would have been an article I would have featured on there.
As would the news that French nuclear power stations had to stop running when the water in the rivers next to where they’re situated became too hot. The additional heat of water coming out of the cooling circuits would raise the temperature further, killing aquatic life.
Leaves in the world’s tropical forests are approaching critical temperatures at which photosynthesis breaks down—and a fraction have likely already passed that threshold—raising alarms about the fate of these essential ecosystems under the most pessimistic projections of human-driven climate change, reports a new study.
Source: It’s Getting Too Hot for Tropical Trees to Photosynthesize, Scientists Warn | VICE
The ECOSTRESS data, along with follow-up measurements from the ground, showed that tropical canopy temperatures tend to peak at around 34°C, though some regions experienced temperatures that exceeded 40°C. Because there is a surprising amount of temperature variation between the individual leaves on a single tree, the researchers estimated that about a tenth of a percent of all leaves in tropical forests are annually pushed beyond the critical threshold of 46.7°C that marks the breaking point of photosynthesis.
As global temperatures continue to rise, more tropical leaves will be pushed beyond their photosynthetic capabilities, causing plants to perish. While the researchers emphasized that there is a lot of uncertainty in their models, they warned that an increase in global air temperatures of about 3.9°C could trigger a major photosynthetic meltdown for tropical forests. This estimated increase is within the range of climate models that project a future where human greenhouse gas emissions don’t begin to fall until after 2080.