If you feel like crying, watch footage of a polar bear swimming to the same spot where he swam every year for his whole life, expecting it to be frozen over, only to find that it's now just open ocean thanks to climate change.
Then the camera slowly zooms out, and you see that it's just water as far as the eye can see, and the bear is now just a little speck on the screen, swimming around in circles, waiting to drown.