Spike in Alaska wildfires is worsening global warming, US says

Report from US Geological Survey says northern wildfires must now be seen as significant driver of climate change, not just a side-effect

The devastating rise in Alaska's wildfires is making global warming even worse than scientists expected, US government researchers said on Wednesday.

The sharp spike in Alaska's wildfires, where more than 5 million acres burned last year, are destroying a main buffer against climate change: the carbon-rich boreal forests, tundra and permafrost that have served as an enormous carbon sink.