Hong Kong has surpassed New York City in several ways, including number of high-rises, population density, and modern, highly-efficient mass transit. Yet there is one area in which Hong Kong is lagging far behind -- cutting the energy use and carbon emissions from buildings.

A recent report released by the American Lung Association found that by 2030 the EPA's proposed fuel efficiency standards could prevent more than 2,50...

Maya Lemon, a 23-year-old from Nacogdoches, Texas, grew up just a few miles away from the path of the Keystone XL pipeline's southern arm. Now an o...

How do I make the world like and want electric vehicles faster? Finally, after a year and a half of planning, we are hitting the road on July 4th from Charleston, SC. The electric car, electric motorcycle, and electric scooter will travel for about 43 days on back roads across America.

Global climate negotiations in Doha are nearing their conclusion and the talks are, as ever, beset by myriad divisions between rich nations and poor ones, between established economies and up-and-comers, and between, well, the United States and just about everyone else.

These laggard coal-reliant companies are responsible for ecologically destructive coal mining and the carbon dioxide emissions that drive global climate change, not to mention a litany of dangerous pollutants.

One of the first steps in tackling climate change is to curb greenhouse-gas emissions. The trouble is, both the public and policymakers have been slow to act on a problem they cannot physically see.

It may be hard to imagine, but the outer edges of Antarctica were once green, luscious and teeming with vegetation, a new study has uncovered.

We recently finalized the nation's first-ever Mercury and Air Toxics Standards for power plant emissions. Once MATS is fully implemented, it will prevent up to 11,000 premature deaths, 4,700 heart attacks, and 3,100 emergency room visits across the nation.

The somewhat deflating reality surrounding the global climate talks in Durban, South Africa -- now hurtling toward another arguably empty conclusion -- is that success or failure is heavily contingent on the whims of just two countries: China and the United States. The two nations, after all, produce far more climate-warming gases than their nearest competitors, and their mutual, steely-eyed refusal to budge from their bedrock negotiating positions tends to render even the most conciliatory gestures among lesser polluters both quaint and meaningless.

December 5 marks the beginning of the Sierra Club's Mercury Awareness Week. In anticipation of that, here are four ways to help you keep the toxic stuff out of your life.

When the federal government abrogates its duties under the Clean Air Act or Clean Water Act, does that mean that impacted communities just go along with it?

Some Girl Scouts say palm oil in their cookies are leading to deforestation. Cookies, schmookies, the real question is: should we could we put palm o...

By moving ahead with its own rules, California can bolster the administration's negotiating position with the auto industry. If it declines to send a clear signal now, it risks being hobbled for years by whatever weak action Washington chooses.

International aviation emissions grew by 66% between 1990 and 2005. They form one of the fastest growing sources of emissions. Yet they are currently excluded from the Kyoto Protocol.

It's refreshing to see the UK step in and re-establish international leadership on climate change. The target to halve our emissions by 2025 is the most ambitious in the world.

The European Commission's director-general for transport and mobility policy warned if actions are delayed to reduce oil dependency, "we may be forced to drastically reduce all our mobility."

The Obama administration can't do much to lower the price of a gallon of gas, but it is on the cusp of a crucial decision that could help consumers come out ahead because they would need less gas.

by Sarah Laskow, Media Consortium Blogger For the environmental community, this coming year offers a chance to regroup, rethink and regrow. Two year...