Last year's increase was 50% higher than the average of the past 10 years. Experts say combination of human activities and El Niño drove CO2 to a level not seen in 800,000 years. Show more
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Last year's increase was 50% higher than the average of the past 10 years. Experts say combination of human activities and El Niño drove CO2 to a level not seen in 800,000 years. Show more
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