The two most effective measures to decrease the negative effects of climate change from the options provided would be:
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Give tax incentives for energy conservation in homes and businesses. - Encouraging energy efficiency can lead to reduced energy consumption and lower emissions.
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Transition from power plants that burn natural gas to those that do not use fossil fuels. - Shifting to renewable energy sources (such as wind, solar, or hydroelectric) significantly reduces greenhouse gas emissions compared to fossil fuel-based power generation.
The other options (converting to coal and making gasoline cheaper) would likely exacerbate climate change and are not effective measures for combating its effects.