Fossil fuels are the only source of carbon dioxide large enough to raise atmospheric carbon dioxide amounts so high so quickly.
The most comprehensive database ever assembled of paleoclimate proxies that tell scientists about temperatures since the last ice age ended around 12,000 years ago has been released to the public.
The Arctic's oldest ice is vanishing
December 13, 2016
In March 1988, thick, multi-year ice comprised 26 percent of the Arctic's ice pack. In 2005, that number dropped to 19 percent. In 2013, it dropped to 7 percent.