to mine. this year's annual migration of monarch butterflies has hit an all-time low. the question you should ask is who is killing his butterflies and why should you care? actually butterflies are neat. and they're critical for pollinating our crops so humans can eat food. no butterflies, no crops, no food. man-made herbicides are actually wiping out butterflies food source which is milk weed. today's crops are genetically modified to with stand massive amounts s of pesticides. let's check back on our fire back results, do you think president obama made the right decision to trade five gitmo