Bank of America
Its internal recycling program saves the equivalent of more than 200,000 trees a year, and it offers employees who buy hybrid cars a $3,000 cash-back incentive.

Ceres
A coalition of investors and public-interest groups, Ceres works to improve corporate disclosure and governance with regard to environmental issues like climate change. Its climate risk program now boasts 60 large investors, including TIAA-CREF.

Dupont
Along with reducing emissions of both greenhouse gases and airborne carcinogens, the company hired a former head of Greenpeace as a consultant.

General Electric
Sales of its Ecomagination products, such as solar panels, topped $12 billion in 2006, and cleanup of its PCB dump in the Hudson River is finally under way.

Innovest
This investment research and advisory firm's Innovest Global 100 rating system is the corporate environmentalist's answer to Moody's or Standard & Poor's.

Organic Valley
One of North America's largest organic-farmer-owned cooperatives, Organic Valley Family of Farms gives its 1,201 member farms direct ownership of a business that saw record growth last year.

Starbucks
Its "bean-to-cup" approach creates eco-accountability at every stage of its supply chain, with recycled-paper sleeves alone saving the equivalent of 78,000 trees in 2006.

Tesla Motors
The Tesla Roadster—the hybrid for the environmentally conscious adrenaline junkie—rips from zero to 60 miles per hour in four seconds without a puff of carbon-dioxide pollution.

Whole Foods
The organic-foods giant was the first major U.S. corporation to purchase enough wind-energy credits to offset 100 percent of its electricity use.

Wal-Mart
The former bane of the green movement now has one of the most ambitious environmental plans of any U.S. company: a proposal to power every store with 100 percent renewable energy.

City of Austin, Texas
The capital of one of the nation's most polluted states, Austin plans to make its operations carbon neutral by 2020.