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25 August, 04:45

What has happened in the last 50 years that would make the carbon dioxide levels change?

Question options:

a) continents have moved and altered the air

b) decreased levels of ozone are found in the upper atmosphere

c) the changes in Earth's orbit due to Milankovitch cycles

d) increased burning of fossil fuels by people

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Answers (1)
  1. 25 August, 07:05
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    D. Increased Burning of Fossil Fuels
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