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The annual butterfly migration is underway. For decades scientists have relied on volunteers to tag butterflies to provide details about their journey.

Amid a major drought in the Western U.S., a proposed solution comes up repeatedly: large-scale river diversions, including pumping Mississippi River water to parched states.

California has been drenched by atmospheric river storms since late December, putting a dent in the state’s long drought — but also causing flooding, power outages and at least 18 deaths.

Rain is falling across parts of Northern California and more is possible into the weekend.

Still, there are concerns trouble could arise as more summer heat bakes San Diego.

The reservoir is the largest of seven water storage projects scheduled to receive funding from a 2014 voter-approved bond. Environmental groups oppose the project. They say it would take too much water out of the Sacramento River and harm endangered species of salmon.

The Marshall Fire and Middle Fork Fire, which have forced the evacuations of tens of thousands residents, are considered the most destructive wildfires in Colorado history.

The military is among the largest buyers of independent power systems known as microgrids. They make tactical sense; and environmentalists hope they can help the transition from fossil fuels.

The Mammoth Mountain ski resort in the Eastern Sierra says this has been its snowiest season on record.

Hawaii’s electric utility acknowledged Sunday night its power lines started a wildfire on Maui but faulted county firefighters for declaring the blaze contained and leaving the scene, only to have a second wildfire break out nearby and become the deadliest in the U.S. in more than a century.