Environment

Monarch butterflies are disappearing.

Populations of these distinctive black and orange migratory insects have been in precipitous decline for the past 20 years, but scientists aren't exactly sure what's causing them to vanish.

Copyright 2016 Maine Public Broadcasting Network. To see more, visit Maine Public Broadcasting Network.

Copyright 2016 Valley Public Radio. To see more, visit Valley Public Radio.

Will this summer be hotter than average?

How much rain can we expect?

A key step to answering questions about the weather is to consult the historic record. But what if there were no record? That's the predicament that Rwanda faces. The civil war and genocide that devastated that country in 1994 also destroyed Rwanda's system for tracking weather. The result was that for a roughly 15-year stretch, Rwanda has almost no record of what its weather was like.

Copyright 2016 NPR. To see more, visit http://www.npr.org/.

In 2007, Rick Kinder was working for a contractor, building a house in southern Colorado. The workers had just finished putting in all the doors, windows and sealing the house. Kinder and a colleague were working in the crawlspace, hanging insulation.

"And we just heard this big roar and then a big boom, and it threw us against the walls, and it just blew the whole top of the roof off," Kinder says.

The sun has just set over a swamp east of Santa Cruz, Calif., and Gary Kittleson is putting on a headlamp and waders. The environmental consultant is searching for red-legged frogs. Some years, he says, he would be ecstatic to find just one or two.

Government officials in charge of energy policy from around the world are scheduled to gather in San Francisco on Wednesday and Thursday for the seventh Clean Energy Ministerial. It's a conference to serve as a follow-up to December's climate change talks in Paris.

Copyright 2016 NPR. To see more, visit NPR.

The City of Thornton is one of many growing suburbs of Denver, Colo. On a day without much traffic, it's only a 20-minute commute into the state capitol, and its new homes with big yards make it an attractive bedroom community. Nearly 130,000 people live there, and the population is expected to keep booming.

As part of the Going There series, Michel Martin traveled to Fort Collins, Colo. to host a live storytelling event about owning water and dealing with a future where water may be scarce. The conversation was held in partnership with member station KUNC. It tackled the water issues in the Western United States while also highlighting the water crisis in Flint, Mich. and the challenges faced by Native American communities.

Copyright 2016 NPR. To see more, visit http://www.npr.org/.

She sails by the memory of the stars.

Her bones are lashed together with 6 miles of rope. Her twin wooden masts are lowered and outstretched only by the power of muscled arms. And once fully extended, the red, V-shaped sails announce who she is.

She is the Hokule'a, Hawaii's famous voyaging canoe, built in the double-hulled style used by Polynesian navigators thousands of years ago to cross the Pacific.

Susan Bence

This week's Bubbler Talk question comes from Spencer Hoyt, who asked WUWM: Why is the 425 million year old Schoonmaker Reef so important to metro Milwaukee?

The coral reef existed when North America was covered with water hundreds of millions of years ago, and then it fossilized.

The deep-sea researchers were surveying an ocean ridge off the coast of Hawaii in 2015 and amid ordinary ocean floor fare — a bit of coral, some volcanic rock — they came across something surprising.

"Where did this guy come from? Holy cow!" one researcher said to his colleague.

Pages