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With the passage of AB 1493 in 2002, California became the country’s leader on climate change legislation. Since then, California has met stiff resistance to the implementation of AB 1493 from the U.S. EPA, which has delayed a waiver needed by the state to enforce the law’s stringent tailpipe emissions requirements.

Los Angeles provides an interesting case study for sustainable urban living—in such a vast and diverse city, solutions don’t come easily. Proving the sincerity of its sustainability efforts, L.A. recently approved a green building code to supplement ambitious smart growth practices, and the city’s efforts to promote recycling has led the nation for years.

With a constellation of regional airports, including one of the country’s busiest, LAX, Los Angeles World Airports (LAWA) will play a crucial role in the greening of air travel in the United States.

Public concern over global warming has presented companies of all sizes with a mandate to account for, and reduce, their greenhouse gas emissions. Still emerging, however, are the legal and fiscal implications of carbon emissions caused by corporations.

John Ashton,U.K. foreign secretary's special representative for climate change, details what he sees as an opportunity for the largest public-private partnership in history.

Excerpts from the "Technology Insight—Developments in New and Exciting Markets" panel at the Renewable Energy Finance Forum in London, which surveyed emerging technologies and new approaches to renewable energy.

John Hutton secretary of state for the U.K.'s Department of Business, Enterprise, and Regulatory Reform details some of the ways that the U.K. and California have served to develop complimentary, groundbreaking legislation and technologies that are leading the world in the fight against climate change.

Many of the largest cities in the United States are competing to be the "greenest" city in the country. While the implementation of many of these efforts remains in development, the race never would have started without the leadership of Seattle Mayor Greg Nickels, who forged the way for the first cities to ratify the Kyoto Protocol in the face of federal indifference.

Experts and investors alike agree that wind power is currently the most viable form of renewable energy available for mass production. Yet despite recent improvements in efficiency and cost, wind power has a long way to go.