What are the main causes of pollution in the united states and canada?

In russia which of these challenges affects the transportation of both petroleum products and other goods?

Answer this asap. why did the americans go to china? a. trading b. exploration c. land d. live stock

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.