Scientists said the world is now more dangerous. The scientists study nuclear weapons, climate change and technology. They set the Doomsday Clock. This shows how close the world is to great danger. The clock now says two-and-a-half minutes to midnight. This is the closest it has been to midnight since 1953.

The scientists said President Trump's views on climate change, nuclear weapons, immigration and terrorism added to global risk. They said we need action "very soon" to keep disaster away. They hoped the clock's new time would help people around the world to get their leaders to keep the planet safe and healthy.