The internal combustion engine is turning the Earth into a giant cark park, and greenhouse gases are cranking up the heat. That can mean only one thing: Take your clothes off and ride a bike. Thousands of protesters did just that on June 7.

Anyone who can stare down severe chafing deserves a mighty salute. After our bike ride photo gallery, look for more naked protesters.








Naked Protesters Bike Ride

    Naked cyclists ride their bikes during a worldwide naked cycling protest against cars, emission and aggressive drivers in the streets of Madrid, on June 7, 2008.

    PHILIPPE DESMAZES/AFP/Getty Images

    Naked cyclists ride their bikes during a worldwide naked cycling protest against cars, emission and agressive drivers in the streets of Madrid, on June 7, 2008.

    PHILIPPE DESMAZES/AFP/Getty Images

    Naked cyclists ride their bikes during a worldwide naked cycling protest against cars, emission and agressive drivers in the streets of Madrid, on June 7, 2008.

    PHILIPPE DESMAZES/AFP/Getty Images

    Naked cyclists ride their bikes during a worldwide naked cycling protest against cars, emission and agressive drivers in the streets of Madrid, on June 7, 2008.

    PHILIPPE DESMAZES/AFP/Getty Images

    Naked cyclists ride their bikes during a worldwide naked cycling protest against cars, emission and agressive drivers in the streets of Madrid, on June 7, 2008.

    PHILIPPE DESMAZES/AFP/Getty Images