Better world: Share things
An awful lot of energy could be saved if only people shared things more – especially their homes.Better world: Move to the city
To many, going green means moving to the countryside. To reduce your carbon footprint, though, you'd be better off cultivating an urban idyll.Better world: Vaccinate your children
Fewer than 1 in 150 children die before age 5 in developed countries, and a lot of the credit must go to vaccines. 
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