Greenhouse gases emitted into atmosphere are virtually permanent, and because they (i)____________ in the atmosphere, their effects is (ii)____________. These facts necessitate that policies related to greenhouse gases differ from policies related to various pollutants whose effects are (iii)____________ and often temporary. A. disperse evenly B. subtle C. local D. accrue gradually E. global F. contrary G. persist indefinitely H. transit I. hazardous