The 2013-2014 Assessment Report concluded that global climate change is caused at least in part by the
A) human use of fossil fuels to generate electricity and power engines.
B) human use of chlorofluorocarbons in refrigeration systems.
C) harvesting of millions of acres of corn, wheat, and soybeans around the world every year.
D) depletion of groundwater supplies.
A
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Complete the following nuclear equation:?? ? 
At + 
e
A.
 Rn |
B.
PoC.
 At |
D.
RaE. none of the above
The energy in the Sun's core is produced by
A. fusion of hydrogen to helium. B. radioactive decay. C. chemical reaction of hydrogen and helium. D. release of gravitational potential energy.
The problem of using more of a resource in a year than its annual renewal, growth, or replacement is known as ____
a. natural hazard b. dynamic equilibrium c. pollution d. environmental overshoot e. sustainability
Total world population is ________ billion
A) 5 B) 4 C) 9 D) 3 E) 7