The greenies have been crying for years about the amount of CO2 in the atmosphere. They say that CO2 is a "greenhouse gas" which absorbs the infrared heat the earth is trying to radiate into space, thus warming the earth and the root cause of GLOBAL WARMING. Analysis of ancient air bubbles trapped in arctic icecaps shows the CO2 content in ancient times was around 300 parts per million (PPM) Analysis of modern air shows a CO2 level of 400 PPM. A 25% increase, which the greenies say will lead to the heat death of the earth day after tomorrow. Or sooner.
The greenies claim that the CO2 increase comes from burning coal starting with the industrial revolution (1750 or so) and burning oil starting with the development of the automobile (1900 or so). To halt the CO2 growth the greenies want to put us all back in to a Hiawatha lifestyle, no cars, no oil furnaces, no electricity after dark, and a bunch of other uncomfortable ideas. Gotta save the world you know.
In actual fact, the air is also full of water vapor. Which is as strong a greenhouse gas as CO2. And there is a lot of it. About 11,000 PPM give or take a scosh. It varies from time to time as we all know, some days are very humid others are bone dry. Take 50% relative humidity at 20 C as representative. An increase of 100 PPM of CO2 compared with 11,000 PPM of H2O isn't going to matter for world temperature.
The greenies are getting all hot a bothered by a 1% increase in greenhouse gas in the air.
Relax people, we can drive our cars, travel by air, light our furnaces, and generate electricity and the planet will be just fine.