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Lake Superior is the largest freshwater lake in the world, by surface area, and it has something the other Great Lakes do not: stable populations of mostly native fish species.

But scientists say a key fish in Superior's food web is now in trouble because of mild winters and an appetite for caviar in Europe.

There wasn't much demand for lake herring 10 years ago. It used to be fed to mink and used as fertilizer, according to Craig Hoopman, a commercial fisherman in Wisconsin who fishes around Lake Superior's Apostle Islands.

Copyright 2015 NPR. To see more, visit http://www.npr.org/.

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Copyright 2015 NPR. To see more, visit http://www.npr.org/.

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MELISSA BLOCK, HOST:

Water scarcity is driving California farmers to plant different crops. Growers are switching to more profitable, less-thirsty fruits, vegetables and nuts.

Nowhere is this truer than San Diego County, where water prices are some of the highest in the state.

Grapefruit trees shade the entrance to Triple B Ranches winery in northern San Diego County. The tasting room is a converted kitchen festooned with country knick knacks.

The Fish Creek Fire in Interior Alaska isn't much to look at. It's about 7,500 acres in size, sitting about an hour south of Fairbanks near the twisty Tanana River. The main fire front — the made-for-TV part, with torching trees and pulses of orange heat — flamed out more than a week ago, leaving behind a quiet charred landscape.

Deaths from lightning strikes are up sharply this year, according to the National Weather Service. Here are some myths about lightning, or avoiding it, and tips on how to actually stay safe.

This story initially aired on July 17, 2015 on Morning Edition.

It's high summer, and for a lot of us that means it's time to go camping. This summer, we're celebrating one particular camping trip.

Way back in 1858, Ralph Waldo Emerson, the great philosopher and poet, set out into the Adirondack Mountains in New York. On the famous journey, he took with him some of the most famous artists, scientists and thinkers of his day.

This year, I set out early in the morning in my canoe with a company of my own: environmental activist and writer Bill McKibben and our guide, Mike Carr with the Nature Conservancy.

As California's drought drags on, its almond industry has come under scrutiny. As you've probably heard by now, almonds use a lot of water — about one gallon per nut. Most growers are relying on groundwater even more this year, because their surface water has been cut off. But that brings a different problem all together: too much salt.

Not the salt added to make roasted almonds savory, but salt in groundwater – which is killing trees.

Soon after the Lake Fire started last month, it threatened hundreds of homes. Fire officials in Southern California's San Bernardino National Forest, where the wildfire raged, responded quickly by sending helicopters and more than a thousand firefighters to combat the blaze.

Copyright 2015 NPR. To see more, visit http://www.npr.org/.

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