March 6, 2013, 11am PST
Although California has long been a pioneer in protecting the environment, for its most innovative policies - from mandating renewable energy to limiting greenhouse gas emissions - to succeed, it will need other states, and countries, to follow.
March 1, 2013, 6am PST
In the mountains surrounding L.A. stand some of the most advanced environment analyzing technology in the U.S. The result of this analysis could be "a groundbreaking development in the worldwide fight against global warming."
February 21, 2013, 1pm PST
Part of a larger strategy to address its numerous environmental ills, the world's largest emitter of greenhouse gases will begin taxing carbon emissions, possibly as early as 2015.
February 14, 2013, 10am PST
Environmentalists likely found much to cheer in President Obama's support for bold action on climate change during the State of the Union address. Was their optimism premature?
January 26, 2013, 9am PST
Established eight years ago by a bipartisan coalition of Northeast and mid-Atlantic governors, the Regional Greenhouse Gas Initiative was the first cap-and-trade system established in the U.S. It now faces an uncertain future.
December 29, 2012, 5am PST
NYC's recently released energy efficiency ratings are full of surprises: 1930s landmarks such as the Chrysler and Empire State Buildings outperformed later mid-century structures, as well as contemporary LEED-rated designs.
November 6, 2012, 8am PST
Increasing mileage standards will do little to measurably reduce greenhouse gas emissions. In order to seriously tackle climate change we need to ditch the cars, and the development patterns they encourage, and move to walkable places.
October 14, 2012, 11am PDT
It's hard to believe that in the decades since the impact of greenhouse gas emissions were first recognized, no standard for measuring and calculating emissions has been developed. The introduction of the Community Protocol intends to change that.
October 10, 2012, 8am PDT
Ever wonder how the greenhouse gas emissions of your home compare to your neighbor's, or the supermarket down the street, or the office tower you work in? New software helps visualize such information in three dimensions across an entire city.
August 28, 2012, 11am PDT
By requiring the U.S. auto fleet to average 54.5 miles per gallon by 2025, the standards announced today by the Obama administration will significantly cut U.S. oil consumption and greenhouse gas emissions, reports Juliet Eilperin.
August 24, 2012, 9am PDT
Sixty-one of downtown Pittsburgh's largest property owners commit to cutting energy, water and transportation consumption by 50% over the next 18 years.
August 8, 2012, 8am PDT
A new report released last week documents the energy use of New York's largest buildings for the first time ever. It's the first step in tackling the source of two-thirds of the city's greenhouse gas emissions.
March 19, 2012, 6am PDT
A new report attributes a 9% decrease in greenhouse gas emissions from the nation's power plants in 2009 to the relatively cheap price of generating electricity from natural gas versus coal.
Homeland Security News Wire
March 13, 2012, 8am PDT
With more than 600 cities in the U.S. developing or having enacted formal climate plans, Nate Berg investigates disconcerting new findings that show a lack of any causal connection between greenhouse gas reductions and climate action plans.
January 2, 2012, 11am PST
Emissions would be reduced 25% if Europeans adopted the Danish cycling habit, a new study reports. The ECF warns politicians it would be a mistake to invest heavily in technological solutions like electric cars.
December 12, 2011, 10am PST
With pollution levels becoming dangerous in Rome, Italy, the government is taking a hard line on driving. In late November, only cars with even-numbered license plates were allowed to drive in the city, with odd plates the next.
July 25, 2011, 8am PDT
Not that it's a real surprise that trees clean the air, but a new study shows that greenery in cities can have a significant effect on air quality.
March 18, 2010, 6am PDT
New research suggests that huge domes of carbon dioxide hover over urban areas, which is prompting some scientists and policymakers to stress the importance of cities as the frontlines of the war on greenhouse gas emissions.
November 9, 2009, 10am PST
Reducing greenhouse gas emissions is both a local challenge and a global imperative, says Rohit Aggarwala, the director of Long-Term Planning and Sustainability for New York City.