The ozone hole is virtually gone. The US was the only country to ban F-12 and BTY in 2010 F-22 is taken out of production. The US used only 25% of the world's freon. So nothing was done with the remaining 75% of the freon. If you really think freon alone damaged the ozone, I have a timeshare to sell you. I've heard that one space shuttle mission does more damage to the ozone, that releasing all the freon in the world at once.
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Today's Featured Article - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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