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The Nine Cities With the Best Hope of Becoming Carbon-Neutral
Greensburg was hit by a tornado in 2007 that took out almost the entire town, opening up the possibility of starting again with today's sustainable techniques. According to Popular Science, "A few of the city buildings even power themselves with their own wind and solar generators, and a 10-turbine wind farm outside of town went online in March."
The entire country of Costa Rica is another promising site: they already get 90% of their electricity from renewable energy sources.