It is likely that an increase in global temperature would result in an increase in cloud cover. Which of the following statements BEST describes the total impact of additional clouds on the Earth system?
A) Clouds provide an exclusively positive-feedback response to warming.
B) Clouds provide an exclusively negative-feedback response to warming.
C) Clouds provide both positive-feedback and negative-feedback responses to warming.
D) Clouds provide neither positive-feedback nor negative feedback responses to warming.
C
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No work by gravity occurs for a satellite when it is
A. in circular orbit. B. in an elliptical orbit. C. both of these D. none of the above
Heavy metals remain suspended in the water column indefinitely
Indicate whether the statement is true or false
In a significant 2004 paper reviewing 69 studies on world human population and carrying capacity, the authors estimated that the sustainable carrying capacity of humans for Earth is about
A) 600 million. B) 2.5 billion. C) 7.7 billion. D) 20 billion.
E-85 ________
A) was an international summit of 85 nations that met to determine vehicle fuel efficiency standards B) was an international summit of 85 nations that met to restrict greenhouse gas emissions C) was an international summit of 85 nations that met to restrict CFC use D) is an isotope of uranium used to generate electricity E) is an ethanol-gasoline mixture