Positive feedback loops destabilize environmental systems by creating a "snowball effect," whereby a change in the system causes further change. Which of the following represents a positive feedback loop in regard to global warming?
A) warming of Earth, increasing the evaporation of surface water
B) reforestation, causing a release of carbon dioxide from soil microbes
C) controlling development, resulting in higher population densities in urban centers
D) limiting use of fossil fuels as a source of energy
E) sequestering carbon dioxide underground, resulting in a drop in atmospheric carbon dioxide levels
Answer: A
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