Starting May 14th and ending June 8th, Yahoo! will attempt to find the greenest city in America through the Be a Better Planet promotion. Yahoo! users will have a chance to gain "green" credits for their city through three green activities:

• Answering questions and being selected as a best answer on Yahoo! Answers
• Performing green searches on Yahoo! oneSearch on your mobile phone
• Taking the Green pledge

The winning city will receive a fleet of hybrid taxi cabs from Yahoo!. For their actions, promotion participants will receive free, energy-efficient compact fluorescent light bulbs (CFLs).

For more information, visit: http://better.yahoo.com/planet