President-elect Biden can restore many of the 100-plus environmental regulations that President Trump rolled back, but much of the damage to the climate cannot be reversed. Greenhouse pollution accumulates in the atmosphere, so the heat-trapping gases emitted as a result of loosened regulations will remain for decades, regardless of changes in policy. Moreover, Mr. Trump’s rollbacks of emissions policies have come at a critical moment: Over the past four years, the global level of greenhouse gases in the atmosphere crossed a long-feared threshold of atmospheric concentration.
By Coral Davenport. New York Times. November 9, 2020.