I'm just putting things in perspective:
Your body is exhaling as much CO2 as the tires are while you are airing down.
You air down the tire for 1 minute each x 4 = 4 minutes of exhaled CO2.
You breath all day long 24 hours x 60 minutes = 1440 minutes of exhaled CO2.
Best cure for CO2 reduction = Eliminate about 5,000,000,000 people (of the 6,000,000,000 that inhabit the planet). That would reduce the CO2 that they exhale plus all of the stuff that they operate (vehicles, home heat/air conditioning/lighting, industrial power, etc) by about 83%. The oceans would have no problem getting the atmosphere back to normal. In fact, if you were to turn everything off for about 3 months the atmosphere would be back to normal.
Frying one egg on a propane stove would most likely equal all the times that you will ever air down your tires.
The power to operate an air compressor (either one attached to the trucks engine or to charge the battery to operate the 12v portable one) will most likely create more CO2 than the airing down released....
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I'm totally in agreement that mans' presence on earth is harming the atmosphere. We've just got to put our efforts towards the things that are most likely going to fix it rather than miniscule details that hardly matter.
We could better fix things by:
Living in smaller houses -
Driving vehicles with smaller engines -
Turn off the lights and appliances that we're not using -
Get rid of street lights -
Turn off Las Vegas -
Live closer to work -
Stop paving everything -
Consume a lot less stuff - - -
Does everyone really need three cell phones, four cars with 300 hp engines, three tv sets, two computers, a 3000 sq foot house, a gasoline lawn mower, a gasoline trimmer, a boat with a 200 hp engine, a jetski, a snowmobile, a quad, an expedition vehicle that weighs in at 9000 pounds so that you don't have to sleep on the ground on a tarp?