There is a YouTube channel called "Melody Sheep" that did many videos on climate change and science in general.
Below, there is a musical video featuring Al Gore, which talks about the reality of climate change. This video was made by John D. Boswell and was meant to deliver scientific knowledge via musical form.
The video below is a musical investigation into the causes and effects of climate change and our opportunities to use science to combat it. It features Bill Nye, David Attenborough, Richard Alley and Isaac Asimov.
The following video gives us an illustration of mankind's evolution on Earth as well as the creation of our planet.
Melody Sheep also made a time-lapse of the entire universe: