New study shows that electric vehicles' environmental friendliness depends on where the electricity comes from.
New interactive map shows how energy production in U.S. has grown since 1993.
State mandates and tax incentives make California the most popular state for buying an electric car.
Low oil prices means people will drive more and buy less efficient vehicles, increasing CO2 emissions.
The Obama administration's plan to cut CO2 emissions moves to next step.
New Yorkers and Bostonians will pay higher natural gas prices this winter because of a pipeline crunch.
Negotiators are about to gather in Lima to thrash out the details of the first post-Kyoto climate treaty.
As part of "Grid Week" in mid-November, the U.S. Department of Energy shows how the power grid operates.
How people get their electricity and where it comes from is on the brink of major change in the U.S.
The U.S. is technologically able to kick its fossil fuels addiction by 2050, report says.
The global effort to address carbon emissions is a start but it's not enough to avoid dangerous warming.
Despite gains in renewables, the world is still on dangerous energy-related emissions path, IEA warns.
LED bulb efficiency has risen sharply in 2014, making them among the most efficient lights available.
IPCC analysis of climate change has painted an ugly picture, but it also offers hope and guidance.
For too long we have ignored the relationships between built and natural environments.
Massachusetts and California lead the U.S. in energy efficiency, according to annual ranking.
LEDs could help slow global warming and illuminate the developing world. Now that's worth a Nobel Prize.
How you heat your home depends a lot on where you live, and it has implications on your carbon footprint.
A new report shows how the world could become wealthier by spending more on clean energy infrastructure.
The world's biggest greenhouse gas emitter might be getting serious about kicking its coal habit.