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Last year was the hottest year on record, according to analyses by NASA and the National Oceanic and Atmospheric Administration. Carbon dioxide in the atmosphere, one of the primary causes of global warming, increased at its fastest pace on record last year, too. Humanity is on pace this century to produce enough greenhouse gases, which trap heat and warm the planet, to send global temperatures soaring past the 3.6 degrees Fahrenheit above pre-industrial levels that scientists say marks the point of no return, after which violent weather, surging sea levels, drought and environmental destruction become irreversible.