* Our knowledge of the interior of the Earth is derived almost entirely from highly indirect evidence. How can we get more information?
* Despite substantial increases in the solar "constant" the average temperature on the surface of the Earth has remained very stable for several billion years. The best theory is that this has been accomplished by varying the amount of carbon dioxide in the atmosphere to regulate the greenhouse effect. But just how is this done? The Gaia Hypothesis asserts that the biosphere actively regulates it. More detailed information about Venus and Mars may provide clues.
* How much more carbon dioxide can we dump into the Earth's atmosphere before it ends up like Venus?
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