Group ranks major airlines based on fuel efficiency, but there are many unknowns about how airlines burn fuel.
Report authors respond to reader comments and questions regarding our 2013 Climate-Friendly Cars report.
Could existence of wind turbines slow the planet’s winds to the point where they couldn’t generate any more energy?
White roofs in cities could prevent the world from emitting billions of tons of CO2, according to the White Roof Project.
if you're trying to make a case for people to take advantage of solar power, a little humor might just go a long way.
New study finds a way to double the efficiency of solar cells while cutting the cost. Is this finally the solution we have been looking for?
Recent conferences in Philadelphia and New York take two different approaches to improving cities' energy efficiency.
Summary of the previous week's most noteworthy climate science papers.