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Time to reduce speed limits?
With the oil crisis in the 1970s, some countries reduced their national speed limits in order to reduce the amount of oil used. Maybe it is time to do this again. This would be an easy, cost-effective method to reduce emissions, and these reductions could be realised from day one of this new policy being passed. Current speed limits around the world can be found on the Wikipedia website - I think a global limit of 60mph would be quite effective, without affecting driving times too much.
On the AA website, they say “According to the Department for Transport driving at 70mph uses up to 9% more fuel than at 60mph and up to 15% more than at 50mph. Cruising at 80mph can use up to 25% more fuel than at 70mph. “