Antarctic sea ice is at a record low, fires in Canada are reshaping terrain and polluting the air and record ocean temperatures are threatening coral — while new research suggests critical Atlantic currents could collapse and trigger rapid climate changes.
As temperatures rise and droughts become more common, the ability of the forest to grow back after fires or logging is of concern. That's especially a problem in the Amazon where the trees themselves capture water through their roots and then release moisture back through their leaves. It's estimatedIf drought or logging kills trees there may not be enough left to bring water to the area, meaning what grows back in their place would instead be grassland.
These cold-weather forests run across Alaska and Canada and are estimated to store more than 30% of all forest carbon on the planet. Without them, huge amounts of greenhouse gases would be released into the atmosphere, worsening global warming.Fires in Canada this summer have burned more than 50 thousand square miles of forest.
Forests have always burned but what's happening now is on a different scale, in every part of the country, said Marc-André Parisien, a research scientist with the Canadian Forest Service.
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