I just caught up on watching National Geographic's One Strange Rock episodes. This one was especially interesting about the interaction of the Sun and Earth, the making of oxygen, carbon dioxide etc.

Episode 3. Click the link to watch it without the Portuguese subtitles. They have all episodes aired so far (last one is episode 6 of last week.)

[link to www4.fmovies.se (secure)]

Here it is on YouTube with PT subtitles.



[link to www.youtube.com (secure)]