The two measures that would be most effective in decreasing the negative effects of climate change are:
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Transition from power plants that burn natural gas to those that do not use fossil fuels. - This measure would significantly reduce greenhouse gas emissions from the energy sector.
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Give tax incentives for energy conservation in homes and businesses. - This would encourage individuals and companies to adopt more energy-efficient practices, thus reducing overall energy consumption and associated emissions.
The other options, such as making fossil fuels cheaper or converting to coal, would likely exacerbate climate change rather than mitigate it.