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Hannah Ritchie is the head of research at Our World in Data, an online web publication focused on research and data. She's also a senior researcher with the Oxford Martin program in global development. Hannah: We know that transport tends to emit CO2 because we want fossil fuels to drive our trucks, fire planes, or ships. So you would think that the farther a food has traveled to reach you, the more the CO2 has been emitted in the process.

Having completed several degrees in environmental science, Hannah Ritchie nearly left the field out of helplessness and frustration, worried she would never make a real difference. Today, she's a passionate advocate for changing climate messaging, replacing what she believes are paralyzing--and often false--claims with empowering arguments that people can embrace. Listen as the head of research at Our World in Data talks with EconTalk host Russ Roberts about food emissions, low-carbon technologies, and what the data shows about what matters (and what matters much less) when it comes to climate change.