What should climate-conscious people do to eat most sustainably? How people approach their diet is deeply personal and can be extremely controversial. Roughly 1 in 9 people in the world are undernourished. Addressing hunger while making the food chain more sustainable is critical for addressing climate change. Are GMOs the answer to food shortages, or do they jeopardize our crops with destructive cycles of pesticide resistance? Is our appetite for animal protein unsustainable, is worldwide veganism possible? Greg asks farmers, scientists and others what’s best for climate and our health.