Climate scientists are reportedly facing escalating harassment and threats in the Trump era, bolstering fears of a McCarthy-style crackdown amid the fight against global warming—and prompting vows of resistance from the scientific community at-large.

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Although threats against climate experts are nothing new, the Guardian reported Wednesday on growing fears amid the community that the election of President Donald Trump “has revitalized those who believe climate researchers are cosseted fraudsters.” Trump himself has referred to global warming as a “Chinese hoax.”

As renowned climatologist Michael Mann told the Guardian‘s Oliver Milman, it’s one thing to receive the occasional unfulfilled threat from an anonymous harasser—now, with a climate denier in office leading a conservative Congress and moving to clamp down on environmental information, many of his colleagues in the field “fear an era of McCarthyist attacks on our work and our integrity.”

Peter Fontaine, who represents Mann in a defamation lawsuit against two conservative groups, told Milman, “If you believe climate change is a hoax perpetrated by the Chinese, as Donald Trump does, you will go after anything that opposes that view. A lot of people will be hung out to dry.”

Lauren Kurtz, executive director of the Climate Science Legal Defense Fund, added, “We are hearing from scientists every week who are worried about what is going to happen. Trump himself is a bully and has emboldened a whole trove of people who have become bolder and meaner. That includes those who will target climate scientists.”

But it has also emboldened the resistance.

“I stand in solidarity with brothers and sisters that work to protect human rights, human health, and the environment here in the U.S. and all over the world. The struggle continues.”

Trump’s climate denialism—and general disdain for facts—has prompted efforts like the upcoming Scientists’ March on Washington and the Union of Concerned Scientists’ new whistleblowing website. A group of scientists also launched an initiative to archive climate data before Trump took office, while campaigners with groups like 350.org announced a multi-pronged offensive against the White House.