Human actions have raised the atmospheric level of CO2 from a preindustrial level of 280 ppm to today's value of 380 ppm. This is higher than anytime in the last several hundred thousand years. It seems highly likely that levels will continue to rise in the coming decades.SpinningProbably will since this cycle did happen before. That time the increased CO2 caused grasses and grains to grow at higher elevations and that when we moved from being hunter/gatherers to agrarian. The glaciers receded and we were able to feed domesticated animals in the summers and the winters. From being able to do that we were able to form communities and trade between communities.Seems we've had these cycles of high and low CO2 levels with the worst being low levels because little grew and when that happened we retreated to southern climes or starved. Right now the CO2 levels are rising beyond what mankind produces: we're being outstripped by nature. The Earth is warming from solar activity and the tree-line is moving north – as it does so it creates a massive CO2 sink and, in time, the CO2 produces and CO2 used will form an equilibrium. Never forget: nature eats and will eat what it can take – it now can take CO2.The problem with all this discussion about global warming is that it is not being looked at by science and, if it is, the science is discredited in favor of politicalization. Gone by the ways side are arguments of prosperous nations having the means to create excess so lesser nations are fed but that this excess is a stolen entity from those not having the means to produce excess.In fact, the Kyoto Accord penalizes success and rewards inefficiency. However, to those believing socialism is a system not fully tried to the extent it can be (the Russian experiment didn't carry it far enough in more than 80 years) the whole subject of global warming sets a scene in which those who produce more must pay homage to those who can't.And that's why I am leery about the claims of the causes of global warming.MichaelR
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