Looks like one of many "global warmings" in our planet's history, where were Neanderthal libs to prevent it?
Ugga, me think mastadon flatulence cause big methane cloud in clear air. Much heat from sun trapped by gas. Must switch to vegan diet.
And thus began the Neandrathal races slow decline, steadily pushed back by environmental rapist homo sapien meat eaters. Ugga Gore continued to eat meat however and eventually married a homo sapien woman who admired his cave drawings of carbon offsets.