Question: The ice core studies show that CO2 levels had not exceeded ____ for 800,000 years, but most recently CO2 levels are _____, which is an
The ice core studies show that CO2 levels had not exceeded ____ for 800,000 years, but most recently CO2 levels are _____, which is an increase of ____. 300 ppm, 411 ppm, 45% 411 ppm, 300 ppm, 45% 300 ppm, 280 ppm, 10% 170 ppm, 411 ppm, 142%
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