John Barrowman and David Tennant both appeared on the Live Earth show on Saturday. There are many clips on youtube and here they are;

David Tennant Introduces The Pussycat Dolls



Thanks to Scheherezade for the video above.
Unfortunately the other videos couldn't be embedded but here are the links;

John Barrowman Talks At Live Earth

David Tennant At Live Earth Part 1

David Tennant At Live Earth Part 2

David Tennant At Live Earth Part 3

David Tennant At Live Earth Part 5

Thanks to eonetim for the 5 videos linked above.

Congratulations to everyone involved in Live Earth including David Tennant and John Barrowman.
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