Wood pellets are produced from the waste sawdust of lumber and paper mills. Home-heating stoves burning these pellets can heat homes directly, instead of relying on other energy sources. Heating your home with wood pellets is
A) sustainable, less polluting, and more efficient than heating a home using electricity from a coal-fired power plant.
B) sustainable, much more polluting, and about 30% more efficient than using electricity from a coal-fired power plant.
C) not sustainable but is less polluting and is about as efficient as using electricity from a coal-fired power plant.
D) not sustainable and pollutes more than using electricity from a coal-fired power plant.
A
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South Asia's external trade links were well-established by ancient Greek and Roman times, but its seaborne trade, prior to the arrival of the Europeans in the 1500s, was controlled by
A. the Sinhalese. B. the Mughal Empire's navy. C. the Chinese. D. Arabs.
Vernacular regions normally do not have well-defined boundaries
Indicate whether the statement is true or false.
An extreme example of the greenhouse effect is thought to be associated with an abundance of carbon dioxide in the Martian atmosphere
Indicate whether the statement is true or false
Certain pollutants that enter the atmosphere directly, such as from smokestacks and tail pipes, are called ____
a. ?criteria pollutants b. ?noxious pollutants c. ?primary air pollutants d. ?secondary air pollutants e. ?reactive pollutants