This week in the Planet Earth Podcast: how knowing exactly which bees pollinate which crops may help us grow food more sustainably; and a look at the effects of tiny particles called nanomaterials on the environment and our health.

This week in the Planet Earth Podcast: a look at how technology designed to measure air pollution may soon be used to smell disease on a patient's breath; and the steps British researchers are taking to put a value on all the benefits of nature that we often take for granted.

This week in the Planet Earth Podcast - scientists describe why the planet's least understood but most diverse species of coral is under threat. Also, what the meteorite strike that wiped the dinosaurs out would've been like; and why co2 isn't the only greenhouse gas we should be worried about.

This week in the Planet Earth Podcast: researchers explain why, despite record rainfall, England is in drought. Later, how scientists are using indoor avalanches to figure out where to put buildings and roads. Finally, news of ice loss in Antarctic, and the benefits of bat dung.

This week in the Planet Earth Podcast - we take a closer look at tiny marine plants, which underpin the entire marine food chain and play a vital role in the Earth's climate. Also, how scientists are using volcanic ash called tefra to tell how people may have responded to rapid environmental changes in the recent past.

This week in the Planet Earth Podcast, how fungal infections could threaten our food security as well as the planet's amphibians; work under way to understand the ecosystems around the hydrothermal vents in the Southern Ocean; and how it's people, not buildings, that use energy.

This week in the Planet Earth Podcast, Richard Hollingham hears about new air-quality monitoring that could help mitigate the effects of bad-air days; the effect of climate change on Mediterranean dwarf elephants; and exactly how many litres of water it took to make his morning coffee.

This week in the Planet Earth Podcast: Richard Hollingham finds out why the American signal crayfish is driving out one of the UK's native species; in our latest audio diary, Hannah Grist from the University of Aberdeen talks us through her research on European shags; and what noctilucent clouds tell us about our changing climate.

This week in the Planet Earth Podcast, Sue Nelson goes to the River Thames in central London to find out why nitrate pollution has trebled since the 1930s. Later on, she talks to a researcher about an unusual freshwater bulge in the Arctic, and asks if we should be concerned. Finally, we hear a round-up of some of the news from the natural world.

This week in the Planet Earth Podcast: Sue Nelson visits RAL Space at the Rutherford Appleton Laboratory in Oxfordshire to find out how scientists check if the scientific equipment they put on satellites will work properly once in space. Later she goes to Buckinghamshire to hear how simple changes to hedgerow management could significantly improve winter habitats and food supplies for wildlife.