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The HowStuffWorks Auto Section contains articles about everything from engine workings to classic cars. Learn about cars on HowStuffWorks Auto.

The Union of Concerned Scientists is the leading science-based nonprofit working for a healthy environment and a safer world through a combination of independent scientific research and citizen action.

Edmunds car buying guide lists new car prices, used car prices, car comparisons, car buying advice, car ratings, car values, auto leasing.

ABCNews.com is your breaking news resource for top stories, videos, photos, blogs, special reports and exclusive celebrity interviews on Good Morning America, World News, Nightline, 2020 and This Week.

Yahoo! Answers is a new way to find and share information. You can ask questions on any topic, get answers from real people, and share your insights and experience.

YouTube is a place to discover, watch, upload and share videos.

Read hybrid car reviews and compare hybrid models. Buying guides and interactive tools. Read about plug-in hybrids, electric cars, biofuel-powered cars, fuel-efficient small cars, and other auto alternatives for the 21st century.

The Hybrid Car Organization provides information and resources to consumers interested in hybrid cars and electric vehicles.

Search for new cars and used cars at CarsDirect.com. Research cars and trucks by make and model, sell your used car, and get help with auto financing.