In an exclusive interview, Shell chairman Sir Andrew Mackenzie says the world’s carbon challenge is harder than he realised while running BHP, and it’s time for a global focus on a few winning solutions. This podcast is sponsored by Rio Tinto. See omnystudio.com/listener for privacy information.

On this week’s episode of Tech Zero, we’ll explain why big oil is laying bets on a new type of geothermal energy. This podcast is sponsored by Rio Tinto. See omnystudio.com/listener for privacy information.

Microwave ovens are great at heating up last night’s leftovers, but can they become the low carbon source of industrial heat for big industries like steel? This podcast is sponsored by Rio Tinto. See omnystudio.com/listener for privacy information.