Academic Earth is very much like YouTube, except its contents are more academic. They offers free access to video courses and academic lectures from leading colleges and universities.

Have a look at its videos on Environmental Studies

Green TV: Find out what businesses are doing through these videos on Green TV. Green.tv is a web and broadband channel entirely devoted to environmental programming. On blog.green.tv, the team hope to bring you fun and fantastic information to raise the awareness of green issues and get you riled up enough to act.

Note: the videos take awhile to play… so go and grab that cup of tea first.

Fora.tv provides videos from events, lectures from universities, think tanks and conferences.