| | | Water vapor is Earth's primary greenhouse gas. Why does CO2 matter? Water vapor and feedback mechanisms associated with water vapor is the culprit.
If you go up to Barrow, Alaska, with a temperature of -25F and a dew point of -30F, that is a water vapor concentration of 321 parts per million.
Now Fairbanks, Alaska, has a temperature of -21F and a dew point of -26F. That is a water vapor concentration of 482 parts per million.
Go to Augusta, Maine, reporting 29F and dew point of 20F. That's up to 3,700 parts per million.
Go to Miami, Florida, reporting 78.6F and dew point of 61F. That's up to 18,341 parts per million.
Oh no, Miami updated the dew point to 61.5F. OK, up to 18,663 parts per million. Geez, a 322 ppm increase in less than one hour.
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