There are other bizarre and unkind ramifications. For example, the transport of POPs depends on temperature; in a process known as the "grasshopper effect", these chemicals jump around the globe, evaporating in warm places, riding the wind and particles of dust, settling to Earth in cool spots, and then vaporizing and moving on again. As the POPs move away from the equator they encounter cooler climates with less evaporation. The result is a general drift of these pollutants toward the Poles and mountain areas. Life also becomes "fattier" in colder climates: fish, birds, and mammals need thicker layers of fat for natural insulation against freezing temperatures
