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Rajasthan in northwestern India, is the site of one of the world's oldest civilisations and is known as the desert state. This week's One Planet comes from here, and Mike Williams meets the original tree-huggers - the Bishnoi people who sacrificed themselves 500 years ago by hugging their trees as the King's men chopped them down.

We also explore why land prices in the Tahr desert are soaring and Mike has a cup of tea with one of India's wealthiest businessmen to discuss the country's strong economic growth and its environmental responsibilities.

And we have the final part of our Open University series on your big environmental questions, this time asking just how many carrots would One Planet's carbon emissions produce?

Have a listen and then let us know what you think. Email the team at oneplanet@bbc.co.uk, or join in the conversation on our Facebook page, the link's below.