At some point in the next 30 years, global temperatures are expected to rise 1.5°C above their pre-industrial levels, according to the Intergovernmental Panel on Climate Change. If we doubled the average fuel efficiency of all the cars on the planet, decreased the amount of global automotive travel by one half, increased solar-energy usage 100-fold, and increased wind-power capacity by ten times, we would go half of the way toward averting that temperature increase, assuming all the projections are correct and nothing else in the world changes in the interim.
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