Carbon dioxide levels on the only planet known to be habitable are now more than 50% higher than pre-industrial levels, the National Oceanic and Atmospheric Association reported Friday. They're at the highest levels in millions of years.
Carbon dioxide levels on the only planet known to be habitable are now more than 50% higher than pre-industrial levels, the National Oceanic and Atmospheric Association reported Friday. They're at the highest levels in millions of years.
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