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Test:5th Grade Science
| 1. | The United States Environmental Protection Agency released a report of the different sources of energy and how much of each was consumed between 1949 and 2017. The EPA reported that: “从1949年到2017年,美国总能源使用tripled. Energy use has risen fairly steadily over time, with the exception of a few noticeable declines in the 1970s, 1980s, and late 2000s, which were largely associated with supply shocks (e.g., the 1973 oil embargo) or economic downturn. In 1949, the U.S. obtained 91 percent of its energy from fossil fuels. Despite the emergence of nuclear power and the growth of renewable sources, in 2017, the nation still relied on fossil fuels for 80 percent of its energy needs. For that year, the largest share (37 percent) of U.S. energy consumed was derived from petroleum (including gasoline), followed by natural gas (29 percent) and coal (14 percent). Recent years have seen increases in some sources of energy (natural gas and renewables) and decreases in others (petroleum and coal)."
Burning coal, oil, and gasoline give off sulfur, nitrogen, and carbon into the air. These emissions combine with water vapor in the clouds and make acid – sulfuric, nitric, and carbonic acid. The wind carries acidic clouds, sometimes thousands of miles. They fall to Earth as acid rain or snow. How can the effects of these emissions be decreased? Source: https://cfpub.epa.gov/roe/indicator.cfm?i=93 |
Using coal to power trains, planes, and cars
Driving more gasoline-powered cars
Using electricity derived from wind, water, or solar power
Increase carbon, sulfur and nitrogen use
