Exploring Hydrocarbon Depletion
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dohboi wrote:Good point. One current example of animals unable to migrate is lake fish. Many cannot tolerate heat above a certain level, but this summers heatwaves have exceeded that level for many, so they just die in droves in place--it's a bit hard for them to just swim to a lake further north, since most of these are isolated or connect to streams that flow south.
Last I heard, all species have to now migrate the equivalent of a number of feet a day just to stay in the zone they have evolved to live in. Besides lake fish, all plants obviously have some...trouble migrating at that rate.
The fact that we are experiencing a drought in 2012 comparable to the great Dust Bowl drought of the 1930s–without poor farming practices being partially to blame–bodes ill for the future of drought in the U.S. With human-caused global warming expected to greatly increase the intensity and frequency of great droughts like the 2012 drought in coming decades, we can expect drought to cause an increasing amount of damage and economic hardship for the U.S. Since the U.S. is the world’s largest food exporter, this will also create an increasing amount of hardship and unrest in developing countries that rely on food imports.
Lore wrote:One of the perpetual myths circulating around the Internet about climate change is that life can somehow adapt to climatic shifts in temperature as rapidly as it's occurring. That we will be basking in the shade of palm trees in Montreal Canada eating bananas and pomegranates someday soon. The cynical truth is most life will not adapt so quickly. It takes many generations of natural selection for natural adaption to take place which for some species would amount to a multi-melenial time scale. You can't air drop in the vast majority of plants and animals into an environment not fundamentally suited for them and expect them to thrive. Therefore humans, even as adaptable as we are, will find it very difficult to obtain the basic resources themselves in which to survive.
dissident wrote:The main problem is that biomes don't migrate like weather patterns. You can't have fertile soil in the Arctic tundra and most of the boreal forest regions of Canada, Europe and Asia. So there will not be any farm belt shifting to the pole. You will simply have massive loss of good farmland. All the denier jokers think that food must grow in supermarkets and is somehow not dependent on long term weather changes.
Graeme wrote:Potentially tens of trillions:
http://www.treehugger.com/climate-chang ... money.html
Ridiculous, as if we had another planet to move to...the fact is the cost is immeasurable... our lives...this not a capitalistic enterprise, worse system in the world...it is extinction of the human species.
However, whereas over the twentieth century, the model runs show a first MCA mode that varies quite a bit from model to model and only explains a small amount of the total covariance, once the 21st century is included, the picture changes greatly. Now the effect of global warming is so great that all the models have similar MCA first modes, and that mode explains far more of the total covariance. So Dai's argument is that the same thing will happen with the observations - as global warming proceeds, it will increasingly overwhelm natural sea surface temperature fluctuations, and the overall drying trend that the models show will assert itself in the US also. Indeed, arguably, this has already begun in the 1990-2010 period in which the US has been drying (culminating in the serious drought this summer).
A new scientific study indicates the turn-of-the-century drought in the North American West was the worst of the last millennium—with major impacts to the carbon cycle and hints of even drier times ahead.
The study, titled “Reduction in carbon uptake during turn of the century drought in western North America,” indicates that the major drought that struck western North America from 2000 to 2004 severely reduced carbon uptake and stressed the region's water resources, with significant declines in river flows and crop yields. It was published on July 29 in Nature-Geoscience.
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