I chose this picture to make you think, yes we put some carbon in the air, but what about natural disasters and volcanos, or other natural events that occur in the world? How much do each of the many volcanos in the ring of fire put out every day? How many tons did this fire at a 1/2 acre carwash put in the atmosphere? How many tons of CO2 does the underground coal fire in Centralia, Pennsylvania put out every day? Before you criticize the output of people, think about nature. If it occurs at such a vast rate in nature, are we really going to affect anything by driving our cars? Read more on Volcanoes from USGS
Another statement in her piece, "demand drives the market toward affordability" is a delicate issue. According to the documentary "Food Inc." this drive for affordability is what creates the low food quality for low food price that you see in the store. Walmart is the largest company ever to adopt some organic foods, so the possibility is there, but will take a long time. See the documentary at Food Inc video .