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Carbon dioxide hits record level in atmosphere, causing climate ... - NPR
Carbon Dioxide Levels Have Passed a New Milestone
During a year of extremes, carbon dioxide levels surge faster than …
Carbon dioxide now more than 50% higher than pre-industrial …
Carbon dioxide levels in the atmosphere are surging "faster ... - CBS News
Carbon dioxide, methane levels in the air ... - Associated Press News
Carbon dioxide, methane levels in the atmosphere hit record …
Climate Change: Atmospheric Carbon Dioxide
Carbon dioxide is accumulating in the atmosphere faster than …
A New 66 Million-Year History of Carbon Dioxide Offers Little …