Some leaves in tropical forests from South America to South East Asia are getting so hot they may no longer be able to photosynthesize, with big potential consequences for the world’s forests, according to a new study.
Leaves’ ability to photosynthesize – the process by which they make energy from carbon dioxide, sunlight and water – begins to fail when their temperature reaches around 46.7 degrees Celsius . While this may seem high, leaves can get much hotter than the air temperature, according to the report published Wednesday in Nature by a group of scientists from countries including the US, Australia and Brazil.
7 degrees Celsius of warming above pre-industrial levels. But it is within the range of the most pessimistic climate scenarios if the world continues to burn fossil fuels. While these figures may seem small, the risk is significant given how critical tropical trees are for life, the climate system and the planet.
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