Global warming can be controlled by

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increasing deforestation, slowing down the growth of human population.

increasing deforestation, reducing efficiency of energy usage.

reducing deforestation, cutting down use of fossil fuel.

reducing reforestation, increasing the use of fossil fuel.

answer is C.

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Detailed Solution

Global warming can be controlled by reducing deforestation, cutting down the use of fossil fuel. Deforestation results in a reduction of the number of trees that can absorb carbon dioxide (CO2) during photosynthesis, thereby increasing the concentration of CO2 in the atmosphere, leading to global warming. Similarly, the use of fossil fuels, such as coal, oil and natural gas, releases large amounts of CO2 into the atmosphere, contributing to global warming. By reducing deforestation and cutting down the use of fossil fuels, the concentration of CO2 in the atmosphere can be reduced, thus helping to control global warming.
(1) Increasing deforestation will only worsen the situation. Slowing down the growth of the human population may help in reducing the pressure on resources, but it is not directly related to controlling global warming.
(2) Increasing deforestation and reducing energy efficiency will only add to global warming.
(4) Reducing reforestation and increasing the use of fossil fuels will only worsen the situation.

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