Air New Zealand conducted a two-hour test flight Monday in which one of four Rolls-Royce engines on a jetliner was powered by a biofuel blend, another step down the long path the airline industry is taking to reduce carbon emissions.

Rise in water temperature having profound effects

Saving water, using more renewable energy and protecting undeveloped land were strategies announced Wednesday by King County Executive Ron Sims to respond to global warming.

At last month's "climate change summit" hosted in Seattle by state Insurance Commissioner Mike Kreidler, it was King County Executive Ron Sims who stole the show.

Can Ballard become the first carbon-neutral community in the country? A gathering of politicians, environmentalists and business people Wednesday answered that question with a definite "yes."

Clean tech has come of age. That was one of the messages Wednesday from the "Investing in Clean Energy" conference at the Washington State Convention and Trade Center.

Sustainable building specialist Thor Peterson offers a tip on an important job as we head into heating season.

Smart Homes columnist Jim Dulley discusses the pros and cons of using a heat pump for winter heating and summer cooling.

Seattle residents heating with natural gas likely will pay more this winter than last, while those using oil could pay less, local utilities said Tuesday.

The prospect that developers would scrap dozens of downtown Seattle apartment towers because of a proposed energy-efficiency measure helped kill the proposed rule Friday.