Don

AS a suburban environmentalist, Mike Tidwell, 45, of Takoma Park, Md., always felt like a walking contradiction.

Though he had quit his job as a journalist to work for environmental nonprofit organizations, Mr. Tidwell viewed suburbs (his own hometown is just outside of Washington) as places built


For years, Mr. Tidwell led an environmental campaign, one with few followers. In 2002, he started a neighborhood cooperative to buy and distribute organically fertilized corn kernels to burn in pellet stoves (a lower-emissions alternative to traditional fuel-oil boilers). At first, the cooperative consisted of just him and three other residents.

But lately, after the release of Al Gore