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To: Terry Maloney who wrote (12290)	12/30/2001 7:26:59 PM
From: Moominoid	Read Replies (1) \| Respond to of 74559

Plants live on CO2, it's actually in relative short supply in the atmosphere. In the Cretaceous the levels were 3 times or more today's levels for example. Now, that means plants need to keep the pores on their leaves (stomata) open a long time to let enough air in so they can absorb enough carbon dioxide. But that means that water escapes. As the concentration goes up, plants in humid environments can grow faster and bigger, and in arid environments they lose less water and so can survive in more extreme environments. I don't have links, I read all this in the academic/scientific literature - it's all well know, just ask Maurice. The problems for plants are due to the indirect effects of climate change and human fragmentation of the environment. So for example, as sea levels rise in Bangladesh in the past mangroves could just migrate inland but now the land behind them is all in rice cultivation, the same applies for the migration of plants everywhere else in fragmented natural environments. David