Students at MIT developed a method to produce ________ from agricultural wastes, resulting in a safer indoor fuel for use in developing countries
A) ethanol B) biodiesel C) fuel cells D) wood E) charcoal
E
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Prime farmland soil that is a few centimeters thick may require 500 years to mature
Indicate whether the statement is true or false
An economist is more likely to identify __________________ as a more efficient and flexible way for society to __________________________ .
A. marketable permits; allow a limited, declining amount of pollution to occur B. better defined property rights; to address issues of allowable levels of pollution C. market-oriented environmental tools; enforce strict limits on emissions D. better defined property rights; to shrink pollution levels over time
The particular combination of inputs that are used to produce and output is called human capital
Indicate whether the statement is true or false
The influx of high-energy radiation and tiny particles varies as the Sun's intensity changes or when a ________ occurs, which is a stellar explosion at astronomically close distances.
A. solar eclipse B. quasar C. pulsar D. supernova