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When it comes to the natural world, glaciers are some of the earth's most remote and inhospitable habitats.
Many of us will never even come close to stepping foot them, let alone living on them.
Yet humans have an intimate and significant relationship with these vast sheets of ice.
They exert a huge effect on how we lead our lives and the way in which we live, even when we're based thousands of miles away.
My two guests today are acutely aware of their relevance and have spent their careers studying glaciers from around the world.
Gemma Wadham is an award winning glacier biogeochemist.
Her book Ice Rivers is written for a non science audience.
And Heidi Sylvestre is a french scientist who's part of the Arctic monitoring and assessment program and works on a project looking at the last glaciers of Africa.
A very warm welcome to both of you.
Oh, thank you so much.
Super happy to be with you today.
Yeah, thank you, Heidi.