Researchers just supplied more evidence that climate change-related temperature increases are having a material effect on the planet. America's National Oceanic and Atmospheric Administration reports that snow cover in the lower 48 states is the lowest ever recorded for mid-November. As you can see in the map below, there's very little snow on the ground in the country -- you'd likely have to climb a mountain to see it. For contrast, the average snow cover between 1981 and 2010 reached as far south as New Mexico.