A scientist with a cigarette lighter is providing the latest evidence of global warming’s dramatic and swift impacts in the Arctic.

Four miles south of the Arctic Circle, Katey Walter has found that melting ice and permafrost are releasing vast amounts of methane — a greenhouse gas 21 times worse than CO2 as a contributor to climate change.

To prove the point, Walter stoops down to melting pools and flicks her lighter to ignite methane flame jets 20 feet high. It’s a "time bomb" that even slightly warmer temperatures could set off, she told the Los Angeles Times.