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The most effective ways to cut down your emissions are to reduce your intake of meat (especially beef, which can cut out about a metric ton of CO2eq per year), to reduce the amount you travel (driving half as much would cut out two metric tons of CO2eq per year and one fewer round-trip flight from London to New York would eliminate a metric ton of CO2eq), and to use less electricity and gas in the home (especially by installing loft insulation, which would save a metric ton of CO2eq for a detached house).
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William MacAskill (Doing Good Better: How Effective Altruism Can Help You Make a Difference)