Astronauts from all over the world (and from space) came together to film a video urging politicians at the U.N. Climate summit in Paris to take drastic action in order to save our planet and slow climate change.

“This is the biggest problem the world has to face right now.”

One astronaut remarked that she wished that the summit could be held from space so that all of the world leaders could see what exactly is at stake.

“Our earth has cancer. I have cancer,” said Astronaut Wubbo Ockels, Ph. D, the first dutch citizen in space. The video notes that Ockels died the day after his interview.

The video is a powerful and desperate plea from Ockels and others to take action, unite, and save humanity. Watch.