US carbon emissions are down c.20% from their peak over the past 20 years, thanks primarily to efficiency gains, such as increased miles per gallon for cars, switching to LED lights and moving towards high-efficiency boilers.Further emission reductions will require more changes from consumers on a number of fronts, such as switching from fossil fuels to electricity for cars, home heating, and so on.The US government is trying to influence behaviours through a range of subsidies and incentives. Is pushing on all fronts the best approach, or should efforts concentrate on one big issue that can have an outsized impact over the long term?In episode 62 of The Flip Side, Global Head of Research Jeff Meli debates that question with Will Thompson from our Sustainable and Thematic Investing Research team.

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