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This US site has a great idea it enables the air-quality-conscious to adopt a square mile of the sky for free. By adopting part of the sky you sign a petition for better air quality regulation. The petition will later be delivered to the EPA, where new ozone limits are currently being tossed across the table
Go on Adopt some SKY 
Plus as a bit of Viral Fun you can get your friends to sign and then go look them up…