FURTHER DISTRESSING NEWS ABOUT CLIMATE CHANGE.

A significant number of trees in tropical ecosystems are being subjected to a dangerously high temperature threshold where the process of photosynthesis begins to fail, new research has found. The study published in the journal Nature says the impact of high temperatures is already visible on plants, and a small but significant percentage of leaves within these vital ecosystems are teetering on the brink of the critical temperature threshold, which could have far-reaching consequences for their survival. The study reveals that an estimated a small but growing percentage of leaves in the upper canopies of tropical forests are currently experiencing temperatures that surpass the critical threshold for photosynthesis to function properly. This threshold, around 46.7C on average, marks the point at which the photosynthetic machinery within tropical trees begins to deteriorate, threatening their survival. Tropical forests, often referred to as the lungs of the Earth, play a key role in absorbing carbon dioxide and supporting a vast array of biodiversity. However, the delicate balance of these ecosystems is under threat as global temperatures continue to rise. Explaining about the impact of reduced photosynthesis, Dr Kevin Collins, senior lecturer environment and systems, The Open University says: “For humans, a reduction in photosynthesis could lead to reduced harvests, especially in warmer climates. Tropical forests are also key climate regulators of regional and global climate and any stress on them adds to the effects of climate change.”

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