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Global warming? The thermometer doesn't lie

A thick blanket of smoke is seen against

A thick blanket of smoke is seen against the setting sun as young ragpickers search for reusable material at a garbage dump in New Delhi, India on Oct. 17, 2014. A groundbreaking agreement struck Wednesday, Nov. 12, 2014, by the United States and China puts the world's two worst polluters on a faster track to curbing the heat-trapping gases blamed for global warming. Credit: AP / Altaf Qadri

The year that just ended was the hottest yet, in records going back to 1880. That means the 10 warmest years on record have all occurred since 1997, and the three warmest are 2014, 2010 and 2005. We can continue to have meaningful discussions about why the Earth is warming and what, if anything, we're willing to do about it. But we need to stop spewing hot air in arguing about global warming. It's necessary and fine to debate policies, but debating clear evidence presented by thermometers is pointless.