1. FOSSIL FUELS
Oil drilling wastes, long buried under Canada's permafrost, leak into the environment
For decades, companies exploring for oil and gas in the Arctic's remote southern reaches have disposed of their drilling waste in the cheapest and most convenient way possible: by digging massive pits to hold the waste and then capping them with frozen permafrost. And for decades, the waste harmlessly sat in the frozen tombs.Then climate change set in, causing the permafrost to begin melting.