A rapid snowmelt -- at least when measured on a geologic time scale -- is already underway in the earth's polar regions. In just the past 50 years scientists have documented an average temperature increase of 4 degrees in the Arctic and Antarctic. The effect of the temperature change is most visible in areas where plants and animals are pushing further into once barren landscapes. Environmental photojournalist Gary Braasch (BRA-shh) has documented these changes in his new exhibition of photographs called "Polar Thaw: Global Warming in the Arctic and Antarctic." I met up with Braasch at the Science Museum of Minnesota today where his pictures are on display.