It has been suggested that the threat of global warming can be addressed by geoengineering strategies. Which strategy has not been examined by researchers?
A. adding iron to the oceans
B. building lots of chemical plants to remove ocean acidity
C. injecting sulfate particulates into the stratosphere
D. covering the oceans with Styrofoam chips
E. placing giant mirrors in orbit above the earth to reflect sunlight
Answer: D
Environmental & Atmospheric Sciences
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