This week in the Planet Earth Podcast: Ciaran Beggan and Tom Shanahan of NERC's British Geological Survey explain why accurately measuring the Earth's magnetic field is so important.

This week in the Planet Earth Podcast: Kenny Black and Jo Gosling of the Scottish Association for Marine Science describe the work they're doing to make fish farming sustainable.

This week in the Planet Earth Podcast: Phil Kerrison and Lars Brunner from the Scottish Association for Marine Science explain how seaweed could be cultivated to fuel a power station, your car or even aircraft.

This week in the Planet Earth Podcast: Karl Ritz and Robert Simmons of Cranfield University, and Guy Thallon from fresh produce company, Produce World, talk about how they manage one of the most crucial ingredients needed to grow vegetables - soil.

This week in the Planet Earth Podcast: Stuart Cunningham and Estelle Dumont of the Scottish Association for Marine Science describe their part in a major international scientific project to monitor crucial ocean currents in the North Atlantic which shape Britain's climate.

This week in the Planet Earth Podcast: Richard Sanders from the National Oceanography Centre and Captain of the Royal Research Ship Discovery, Antonio Gatti, describe the new 100-metre-long vessel's next-generation scientific capabilities.

This week in the Planet Earth Podcast: Kirsty Penkman, Kirsty High and Nicky Milner of the University of York explain how chemistry can be used to work out which archaeological sites need urgent excavation to save artefacts from degrading.

This week in the Planet Earth Podcast: Richard Buggs and Lizzy Sollars of Queen Mary University of London describe the latest UK efforts to breed ash trees that are resistant to the dieback disease that's currently ravaging East Anglia and the south east of England.

This week in the Planet Earth Podcast: Jason Hopkins of NERC's National Oceanography Centre and Paul Bown of UCL (University College London) describe how microscopic marine creatures that have been absorbing carbon dioxide for more than 200 million years coped with climate change 56 million years ago.

This week in the Planet Earth Podcast: Ruth Welters and Marije Schaafsma from the University of East Anglia talk about a ground-breaking project which brings together scientists and economists in a bid to put a value on everything the environment can give us.