People are taking steps big and small to move the dial on climate change. This week, in Here & Now's Reverse Course series, senior editor Peter O’Dowd and producer Chris Bentley take listeners across the country for a closer look at projects designed to make an impact. This episode looks at big commercial airliners, some of the fastest-growing sources of climate-warming pollution on the planet. Scientists and entrepreneurs are trying to solve that problem with sustainable aviation fuels, such as electric batteries and hydrogen. Dive deeper into this episode here. Find out more about the Reverse Course series and listen to the previous nine episodes here.