NASA climate scientist James Hansen has gotten himself arrested while protesting mountaintop coal mining. Again.

The Huffington Post reports that he was among about 100 people arrested outside the White House yesterday while protesting this particularly troublesome form of coal mining. The same thing happened last June, a few months after Hansen proclaimed his willingness to be arrested during another protest.

Hansen has long held that the best way – and perhaps the only way – to address global warming is to leave coal in the ground. When it comes to mountaintop removal, as the language would suggest, companies must first remove the tops of mountains in order to get at the coal. The resulting debris is shoved off into the valleys below.

Many hoped the administration of Barack Obama would shut down the practice when it entered office, and last year the Environmental Protection Agency put Arch Coal’s Spruce No. 1 mine in West Virginia on hold. No word on when the EPA will reach a final decision.