From the Lexington Herald-Leader:

The first question of the session was also a first for Clinton.

A student said mountaintop removal mining was a big issue in Kentucky, and he wanted to know whether Hillary Clinton would do anything to help stop the process that strips the tops off mountains to get at the coal underneath the surface.

It was the first time Chelsea Clinton had ever been asked that question. Clinton said her mother plans to invest in coal research to discover the best way to address energy and environmental concerns.