Global warming is not a theory. It’s air pollution, plain and simple.

In this Op Ed for the New York Times, the Bulletin’s Lawrence Krauss and David Titley note that this year marks the first time that the Bulletin decided to advance the clock largely because of the statements of a single person. But when that person is the new president of the United States, his words … Continued

The president-elect talks about intelligence the same way he talks about climate change: He refuses to believe the experts, and that’s dangerous.

Are we too eager to write things off as mistakes?

For societies to cope with catastrophe they must first recognize its existence. When large numbers of people reject an engulfing catastrophe, that society may become stagnant or it may become disrupted by violent conflict over the meaning of what they have experienced. Trumpists’ confused rejection of the Covid-19 pandemic is a case in point.

Trump, like no other president in recent memory, is a card-carrying conspiracy theorist. What's in it for him?

President Donald Trump and Joe Biden, the Democratic nominee for president, will debate tonight. Although the United States leads the world in coronavirus cases and deaths, Trump will try to reframe his administration's response to the pandemic with statistics and policies that paint a somewhat rosier picture.

It could be a nuclear winter machine. Or an actual nuclear football.

The New START treaty is a beautiful, beautiful deal. Here are five reasons it's good for Mr. Trump, and America too.

If Trump Tower and other Trump Organization-owned sites don’t cut emissions, then it will owe $2.1 million per year starting 2030.

Former Secretary of State George Shultz has urged what seems obviously to be the wisest course on the INF agreement: “We should fix it, not kill it.” Unfortunately, it appears that the INF is in the hands of treaty killers.

Now is not the time to upset US allies

The most important issues to address are the truly existential threats we face: climate change and nuclear war

A collection of commentary on President Trump's decision to withdraw from the Paris Agreement on climate change

Of all the humanitarian issues on which Trump might have taken a passionate position, chemical weapons turned out to be what motivated him. This says a great deal about chemical weapons’ psychological power.

Leading climate experts share their thoughts on President Trump's Energy Independence Executive Order.

The author of Command and Control explains why the tweeting of Donald Trump and the vulneratibilites of the American nuclear command system are, together, exceedingly dangerous. 

Biden did a lot with the stroke of a pen. But Congress still has to deal with a slew of last-minute anti-climate initiatives enacted by Trump. And do it fast, before the deadline is up.

The Facebook Oversight Board announced on May 5 that the platform's suspension of former president Donald Trump could stand. Far from being “cancelled,” however, Trump these days has been able to use regular TV appearances to reach millions of viewers with his familiar grievances.