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The ongoing rise in greenhouse gas emissions may trigger a rapid, irreversible collapse in an Antarctic ice sheet the size of Mexico, with potentially catastrophic consequences, a study published last week in the journal Nature found.
Extreme temperatures linked to climate change can be expected to cause a significant increase in the number of premature deaths, according to a report released Monday by the Obama administration.
A new report nearly doubles previous predictions for sea level rise if global emissions continue unabated, portending a doomsday scenario for many of the world’s coastal cities.


News of Climate Change

Earth's temperature is increasing at a rapid speed. Global warming is pushing air and ocean temperatures higher and higher. According to climate experts and scientists, global warming could lead to worst coral bleaching in two decades.

Bleaching occurs when coral expels protozoa that live on their tissue, zooxanthellae. Healthy coral depends on the unicellular organism for pigmentation and photosynthetic abilities. When coral expels zooxanthellae, it becomes vulnerable to other environmental stressors. After that, it becomes unappealing to fish. Coral reefs are very essential part of food chains. It is a kind of backbone for oceans' several food chains. It not only serves as food for a wide variety of smaller fish and other marine creatures, but it also provides them shelter. To sustain the biological diversity, it is important for coral reefs to stay healthy. But as the temperatures have been rising at a rapid speed and waters are becoming more acidic, events of bleaching are happening frequently. During a recent interview, head of National Oceanic and Atmospheric Administration's Coral Reef Watch program, Mark Eakin, said, "As the ocean becomes more acidified, the bleaching threshold for corals drops, more carbon dioxide makes corals more sensitive to thermal stress. Not only are we seeing more thermal stress but we're making them more sensitive at the same time". Experts have already seen events of bleaching in area such as Tuvalu, Kiribati, Florida, Guam, Hawaii and the northern Marianas Islands. According to them, it was just a start and larger events could happen throughout the Pacific Islands and the coasts of Australia. The last huge bleaching event occurred in 1998. At that time, global warming and an El Nino event had triggered coral colonies to send their zooxanthellae packing. The event had been responsible for killing about 15% coral of the world.

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