In recent years, investors of all kinds bet big on the future of the so-called Green Economy. But now, some hedge funds are shorting green stocks — a sign that investor enthusiasm may be waning.

A new Bloomberg analysis examines the positions that more than 500 hedge funds have taken on the green economy. On today’s Big Take podcast, Bloomberg ESG reporter Sheryl Lee joins host David Gura to discuss the findings, and why some investors who had bet on a sustainable future are now betting against it.