Stanford University’s endowment fund is a fat one — nearly $19 billion rich. And, moving forward, none of those riches will be sunk into the ghastly practice of coal mining.

The university — which is situated on the edge of Silicon Valley, a hotbed for clean technology companies like Tesla — announced on Tuesday that its board of trustees had approved a divestment resolution. According to the university’s statement, the fund will sell off stocks and abstain from buying any more in “publicly traded companies whose principal business is the mining of coal for use in energy generation.”

“Stanford has a responsibility as a global citizen to promote sustainability for our planet, and we work intensively to do so through our research, our educational programs and our campus operations,” Stanford President John Hennessy said in the statement. “Moving away from coal in the investment context is a small, but constructive, step while work continues, at Stanford and elsewhere, to develop broadly viable sustainable energy solutions for the future.”