Trump's "Dolchshut" against the climate: experts fear comeback of acid rain

Saurer rain has not been an issue in Western countries for decades. Donald Trump's unprecedented environmental deregulation could change that.

Gene Likens, a scientist who discovered acid rain in North America years ago, warns that the US could face this problem again, despite decades of working for clean air. This could happen after the Trump administration rolls back pollution regulations. We know this problem from the Polish and Czech mountains.