This week in the Planet Earth Podcast - Richard Hollingham goes to the River Wandle in south-west London to find out how scientific research is helping to revitalise this heavily-used river; later he goes to Cambridge to hear about some of the hottest conservation topics for 2012.

• Revitalising urban rivers, hot conservation topics - Naked Scientists Science Podcasts and Science Radio Shows
• Revitalising Urban Rivers - Planet Earth Online - Interviews
• Ugly Animals Need Love Too - Podcasts
• Nuclear: About to Explode? - Podcasts
• River Thames pollution, Arctic freshwater bulge - Podcasts
• Diving into Naked Oceans! - Podcasts