By Hank Green

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6 stupidly simple steps to save billions of gallons of gas.
A green idea: Put your coins back in circulation.
A hike in the price of stamps is incentive to ditch snail mail and curb your carbon footprint.
How to give and get perfectly good stuff for free, reducing waste.
An interactive map for finding people on the same page.
The cost of owning a car is going up in more ways than one.