In the past decade, a lot has changed in our fight against climate change.

In a recent Q&A with Sen. Bernie Sanders published in The Guardian, former Vice President Al Gore pinpointed "two big things" that have changed since his groundbreaking documentary "An Inconvenient Truth" hit theaters in 2006.

Photo by Neilson Barnard/Getty Images for The New York Times.

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Solar energy is getting so cheap that even this coal museum is using it.

The move is symbolic of a lot of the progress made in green energy as of late.

Deep in the heart of coal country, a very unexpected business is going green.

The Kentucky Coal Mining Museum is adding solar panels to its building.

The museum, located in the southeast Kentucky town of Benham, aims to shine a light on the important role coal played (and continues to play) in meeting our energy needs — which makes it worth asking why it's moving away from its namesake fuel source to suit its own power needs.

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Breaking with his party, Republican Governor John Kasich in Ohio took a small, but significant step toward fighting climate change.

John Kasich. Photo by Alex Wong/Getty Images.

In 2008, the Ohio legislature passed a bill requiring that 12.5% of energy supplied to customers in the state come from renewable sources. In 2014, midway through his first term, Kasich signed a bill freezing those standards.

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The Chernobyl meltdown on April 26, 1986, remains the most ruinous nuclear catastrophe in world history.

More than 30 people died in the immediate aftermath, and cleanup costs ran into the billions of dollars.

After the meltdown, the city and surrounding areas were evacuated, leaving 1,600 square miles of radioactive real estate rotting away in what was then the Soviet Union, now Ukraine.

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