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Politics : The Environmentalist Thread -- Ignore unavailable to you. Want to Upgrade?

To: neolib who wrote (23530)	12/25/2008 4:38:49 AM
From: Maurice Winn	1 Recommendation Read Replies (1) \| Respond to of 36917

Neo, I don't have a graph, but if CO2 was at 280 ppm the plant would need more water than at 380 ppm. According to botanists it is a significant amount more water. "Realistic atmospheric CO2 levels" are 280 ppm and 380 ppm. In a desert, water would still be the dominant limiting factor, but having increased CO2 reduces the dominance of water as a limiting factor. You can see from the design of desert cacti that CO2 isn't much of a problem for them compared with water. That's why they don't have leaves and why they grow tall and thin, minimizing their exposure to sun high in the sky but in winter, they are more exposed to the sun which is coming in from a lower angle. Plants which need a more sun and have plenty of water can have big leaves. You can easily figure out from that information that plants have different needs in different places at different times. Sometimes they are short of water, sometimes short of light, sometimes short of CO2, sometimes short of nutrients. Mqurice