Among greenhouse gases, carbon dioxide is the most significant contributor to global warming and therefore, public enemy No. 1 when it comes to stopping the climate crisis.
But methane -- the main component in natural gas and an even more effective heat-trapping gas -- is a close second. Scientists say that atmospheric methane is now responsible for about 25 percent of the human-caused warming we see today. Australia is burning. The Arctic is melting. Yet Trump keeps gutting climate change regulations.
"To solve the puzzle, the scientists looked for clues in ancient air bubbles trapped in Greenland's ice sheet.By measuring the presence of carbon-14 -- a rare radioactive isotope -- in the air samples, the scientists were able to determine natural historical levels of fossil methane. Their findings showed that naturally occurring fossil methane levels are actually about 10 times lower than what past research had shown.
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