There are visible, dramatic effects of the rapidly warming Arctic. The permafrost – up until now, permanently frozen land and soil – is thawing out, and revealing its hidden secrets. Alongside Pleistocene fossils are massive carbon and methane emissions, toxic mercury, and ancient diseases.
The "ancient diseases" are from thousands of reindeer killed by anthrax, frozen and now thawing and releasing their microbes.
I didn't know about the mercury. "The Arctic is home to the most mercury on the planet. The US Geological Survey estimates there’s a total of 1,656,000 tonnes of mercury trapped in polar ice and permafrost: roughly twice the global amount in all other soils, oceans, and atmosphere." Who wudda thunk?
Worse, of course, it that as the permafrost in the Arctic melts, the extra CO2 and methane will accelerate global warming even more.
HERE'S the BBC special report on various effects of the warming Arctic.