2016
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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100
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200
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300
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400
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Detailed explanation-1: -The annual globally averaged level of carbon dioxide was about 410.5 parts per million (ppm) in 2019, up from 407.9 parts ppm in 2018, having crossed the 400 parts per million benchmark in 2015.
Detailed explanation-2: -Using measurements taken worldwide, scientists estimated that 2015’s global average carbon dioxide concentration was 399.4 parts per million (ppm), a new record high.
Detailed explanation-3: -In the United States, greenhouse gas emissions caused by human activities decreased by 7 percent from 1990 to 2020. Since 2005, however, total U.S. greenhouse gas emissions have decreased by 20 percent. Carbon dioxide accounts for most of the nation’s emissions and most of the decrease since 1990.
Detailed explanation-4: -GHG would reach almost 685 parts per million (ppm) CO2-equivalents by 2050.
Detailed explanation-5: -The publication, produced by an international team of more than 100 scientists including many experts from NOAA, projects that atmospheric CO2 concentrations will reach an average of 417.2 parts per million in 2022, more than 50 percent above pre-industrial levels.