Climatologists and environmental activists have pointed out that climate change could imperil the growing of barley and the ability to make beer.
Well, not really, as I'm not persuaded that a Prius would actually reduce my carbon footprint much (just the opposite in fact), and of course if the climate changes, one can simply plant barley further north--it's already centered in the Dakotas, Canada, and Minnesota.
But that said, there is actually a very real, insanely cheap way to both reduce carbon dioxide concentrations in the air and enhance the growing of barley; stop subsidies for corn and soybeans. Without those, agriculture would return to a greater dependence on pasture (alfalfa roots go up to 30' into the ground and are a serious carbon sink), and those fields that are plowed would more often be planted in flax, barley, and other traditional cool weather crops.
Then, in turn, people could wear more linen, be cooler, enjoy some liquid bread, and turn off the air conditioning. Now exactly how much of a consequence this might be is up to debate, and should be, but it illustrates how a great part of helping the environment does not consist in fancy new technologies, but rather can be done simply by stopping stupid programs like corn and hybrid/electric car subsidies.
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