Global Desperation – Plants Cause Global Warming?

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Now we really are having some CO2 Insanity.  It’s getting desperate out there folks!  With things like the Hockey-Stick, Glaciergate, Pachaurigate, Amazongate, Africagate and all the other “gates” associated with anthropogenic global warming, including global warming causes sex, or sex causes global warming, we now are hitting another new low in desperation!  Now plants cause global warming! Per this from the Carnegie Institute…

“Plants have a very complex and diverse influence on the climate system,” says study co-author Ken Caldeiraof Carnegie’s Department of Global Ecology. “Plants take carbon dioxide out of the atmosphere, but they also have other effects, such as changing the amount of evaporation from the land surface. It’s impossible to make good climate predictions without taking all of these factors into account.”

Plants give off water through tiny pores in their leaves, a process called evapotranspiration that cools the plant, just as perspiration cools our bodies. On a hot day, a tree can release tens of gallons of water into the air, acting as a natural air conditioner for its surroundings. The plants absorb carbon dioxide for photosynthesis through the same pores (called stomata). But when carbon dioxide levels are high, the leaf pores shrink. This causes less water to be released, diminishing the tree’s cooling power.

The warming effects of carbon dioxide as a greenhouse gas have been known for a long time, says Caldeira. But he and fellow Carnegie scientist Long Cao were concerned that it is not as widely recognized that carbon dioxide also warms our planet by its direct effects on plants. Previous work by Carnegie’s Chris Field and Joe Berry had indicated that the effects were important. “There is no longer any doubt that carbon dioxide decreases evaporative cooling by plants and that this decreased cooling adds to global warming,” says Cao. “This effect would cause significant warming even if carbon dioxide were not a greenhouse gas.”

OK, so where do these people get these ideas from?  There’s plenty of places out there who claim they’ll offset your carbon footprint by planting trees.  Last time I heard, trees were plants.  So if plants cause global warming, then why are we planting trees?  Shouldn’t we be clear-cutting and spraying Roundup on everything we can?  That will surely stop global warming in its tracks!  This might explain some of it.

In their model, the researchers doubled the concentration of atmospheric carbon dioxide and recorded the magnitude and geographic pattern of warming from different factors. They found that, averaged over the entire globe, the evapotranspiration effects of plants account for 16% of warming of the land surface, with greenhouse effects accounting for the rest. But in some regions, such as parts of North America and eastern Asia, it can be more than 25% of the total warming. “If we think of a doubling of carbon dioxide as causing about four degrees of warming, in many places three of those degrees are coming from the effect of carbon dioxide in the atmosphere, and one is coming from the direct effect of carbon dioxide on plants.”

Ahh another goofy computer model that has no basis in reality and probably would even be too much for an episode of the Twilight Zone. Well, ummmm, what about water vapor?  How much does that contribute to global warming?  Per this from Junk

In simple terms the bulk of Earth’s greenhouse effect is due to water vapor by virtue of its abundance. Water accounts for about 90% of the Earth’s greenhouse effect — perhaps 70% is due to water vapor and about 20% due to clouds (mostly water droplets), some estimates put water as high as 95% of Earth’s total tropospheric greenhouse effect (e.g., Freidenreich and Ramaswamy, “Solar Radiation Absorption by Carbon Dioxide, Overlap with Water, and a Parameterization for General Circulation Models,” Journal of Geophysical Research 98 (1993):7255-7264)

Uh oh……the genepool at Carnegie Institute must have forgotten about good old water vapor.  If water vapor contributes 90 to 95% of the greenhouse effect, then don’t you think if the plants are letting less water vapor out that it would have the opposite effect and cause global cooling?  Nah, that just couldn’t be, because it doesn’t fit with the “Inconvenient Truth” of anthropogenic global warming.

Source:  Carnegie Institution for Science

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