In almost every corner of his administration, President Donald Trump has veered sharply from the policies of his predecessor -- and even past Republicans.
But his rollback of regulations designed to limit global warming is one of the clearest ways he has worked to erase a cornerstone of President Barack Obama's legacy.
From
promising to leave the landmark Paris climate accord to
relaxing restrictions on power plant emissions, Trump has attempted to remove many of the guardrails installed by the Obama administration to limit the emissions of greenhouse gases.
These rollbacks come at a critical time. Earth just endured
its hottest month on record, and
Greenland's massive ice sheet is melting an alarming rate.
Last fall, the world's top climate scientists warned that
we have barely more than a decade to drastically cut global carbon emissions, to avoid facing the worst consequences of the
climate crisis -- droughts, wildfires and food shortages impacting hundreds of millions of people.
Regardless of what happens in the 2020 presidential election, critics say Trump has already cemented an environmental legacy that will be felt by generations to come.
"He is locking in permanent, irreversible damage to our environment through his irresponsible environmental policies, including his efforts to block progress on climate change," said Dr. Michael E. Mann, distinguished professor of atmospheric science at Penn State University and the director of the Penn State Earth System Science Center. "Once we go beyond key tipping points -- the melting of the major ice sheets -- there is no going back."
Here's a look at some of Trump's most consequential climate policy rollbacks: