As part of its new "Future Friendly" environmental campaign, Procter & Gamble is launching a new app for the iPhone, iPad or Droid device that lets users "create their own personal planet" by answering various multiple-choice questions, like what the gas mileage of their car is. Through the "My Carbon Footprint" app, people will also be able to use the receive tips on eco-friendly living and post them to their Facebook walls. The app will be released April 22--Earth Day. Kicking off this week, P&G's Future Friendly effort aims to educate consumers about how to its products in more ennvironmentally conscious ways. Brands included in the program include Tide Coldwater, Pampers, PUR and Duracell.