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If its spread over the whole area then its natural.
How do you trace it back to particular sources?
Its easy, I already answered this.
If its from man made sources as you insist that makes it even easier.
It would appear that the anti fossil fuel church of global warming (aka the epa) finds it more politically advantageous to complain about the problem, then to find out what it really is, just incase it turns out to be natural.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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