7.Not Given
See para.8:if sea ice begins to form because of a slight cooling, carbon dioxide?is locked into the ice.That weakens the greenhouse effect.(The passage doesn抰 mention anything about locking Co2 into ice artificially.)
8.True
See para.9:there is no lack of such mechanisms.If you add their effects together, there is more than enough feedback to make Milankovitch work,?The problem now is identifying which mechanisms are at work. This is why scientists like Edwards are not yet ready to give up on the current theory.
9.True
See the sentences in para.9 (According to Edwards, 卙e says.I cant see any way of testing [Ehrlichs] idea to see where we are in the temperature oscillation.) and para.10 (Ehrlich concedes this.If there is a way to test this theory on the sun, I cant think of one that is practical).
10.constant
See para.2:According to the standard view, the temperature of the suns core is held constant by the opposing pressures of gravity and nuclear fusion.
11.orbit
See para.6:Most scientists believe that the ice ages are the result of subtle changes in Earths orbit, 匛arths orbit gradually changes shape from a circle to a slight ellipse and back again roughly every 100,000 years.
12.instabilities
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