BRAZIL – SEPTEMBER 1: Fires started 10k away swept through the rainforest adjoining this land and began to move into a farmer+?s pasture area. He fought for several days at the perimeter to keep the fire from sweeping over the pasture, but it became a losing battle. Net deforestation is estimated to account for about 2 gigatons of carbon in emissions to the atmosphere. Forests may change in response to global warming but continuing deforestation is also contributing to global warming. (Photo by Joanna B. Pinneo/Aurora/Getty Images)