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One problem with all of these approaches is they require more then one subject. Unfortunately we only have one earth, so there is no way to have a natural cont
by JamesBarney 12y ago
One problem with all of these approaches is they require more then one subject. Unfortunately we only have one earth, so there is no way to have a natural control without CO2 rising, or an earth where the CO2 rose at a different time.
- ende 12y agoWe actually do have a positive and a negative control in orbit on either side of the Earth's. Sorta.