During most of our species' 160,000-year existence, and until about 10,000 years ago, we depended on
a. crops
b. hunting and gathering
c. hunting
d. crops and cattle
e. cattle

Extensive and unusual cold snaps have occurred here recently. is this evidence that global warming is lessening or not occurring? no—although the long-term trend is for warming, short-term weather patterns can still be variable. no—melting of glaciers and ice caps is making the oceans cooler, which can cause cold snaps. yes-- if global warming really were occurring, cold snaps wouldn’t happen. yes—due to global warming, weather patterns should be become less—not more—variable.