Drought threatens California despite El Nino

Last winter, El Nino-driven storms dumped much-needed snow and rain over California, boosting reservoir levels and fueling hopes the parched state's four-year drought might end.

Scientists: Largest US reservoirs moving in right direction

Parts of California are under water, the Rocky Mountains are bracing for more snow, flood warnings are in place in Nevada, and water is being released from some Arizona reservoirs to make room for an expected bountiful spring ...

SpaceX poised for high-stakes space station launch

SpaceX on Saturday aims to become the first private company to send its own cargo ship to the International Space Station, a feat that only a handful of world governments have pulled off.

Forest fires in Sierra Nevada driven by past land use

Forest fire activity in California's Sierra Nevada since 1600 has been influenced more by how humans used the land than by climate, according to new research led by University of Arizona and Penn State scientists.

Slope Construction Methods Impact Ecology Differently

Recent low temperatures and massive snow storms may have skiers ready for the slopes, but it's unlikely that a long run through fresh powder makes skiers question how the run was created.

NASA says competition is key to private space race

Competition is vital to the race among private companies to replace the space shuttle, NASA said Thursday, after Congress called for the US space agency to fund a single company.

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