This week, This Matters is publishing episodes of the Toronto Star's new podcast Small Things Big Climate.

Sometimes it feels like you need a PhD to figure out how to shop for lower carbon groceries. Why isn't there a simple rule of thumb to follow? Host Marco Chown Oved starts this episode with a simple question: What's more important for the climate, what you eat or where it comes from? And the answer is: It isn't even close.

Guests: Jonathan Foley, Executive Director of Project Drawdown, Cory Van Groningen, beef farmer at Hillview Farm, partnered with VG Meats and Rowe Farms, Brent Preston, farmer at The New Farm, President of Farmers for Climate Solutions.