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2 January, 19:56

According to scientific data on climate change, what levels have risen by 30% over the past 200 years?

a. ozone

b. argon

c. carbon dioxide

d. krypton

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Answers (1)
  1. 2 January, 20:13
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    Due to human consumption of fossil fuels and the greenhouse effect and methane emissions from natural sources over the last 200 years the levels of CO2 in the atmosphere have risen considerably.
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