The world's farmers bring us food, clothes, and increasingly - greenhouse gas emissions. Through crop and livestock production and land clearing, the world's agricultural sector is a bigger contributor to global warming than the transportation sector. Economist Sara Scherr, CEO of Ecoagriculture Parters, says it's time to start looking at farmers as environmental stewards, not just food producers. She speaks with Steve Curwood about techniques that help farmers mitigate and adapt to climate change.