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Trees don't just add a welcome splash of green to our cities. They absorb CO2, restore biodiversity, improve our wellbeing, and even lower outdoor temperatures in the most concrete-heavy parts of town. Together with a US public broadcaster, we look at what's being done to ensure "urban forests" play a bigger part in the fight against climate change. From San Francisco's stunning Tunnel Tops, to the tiniest of gardens in suburban Tokyo, this movement takes many forms. All are equally inspiring. Host: Catherine Kobayashi Guest: Greg Dalton, Journalist and Host, "Climate One"

Hydrogen fueled the early combustion engine and propelled we humans to the moon. But the story doesn't end there. Scientists around the world are now bringing it back in from the cold to fight global warming. From powering public transport to producing electric vehicle batteries out of waste, hydrogen's potential for once again changing the game is huge. Together with a US public broadcaster, we meet the people ushering in an all-new, all-clean era for this most abundant of natural elements. Host: Catherine Kobayashi Guest: Greg Dalton, Journalist and Host, "Climate One"