text: Read here , here and here . The alarmist AGW hypothesis calls for an increase of atmospheric CO2 to increase atmospheric warming; that will then warm the surface causing increased water evaporation; that will then increase the amount of atmospheric water vapor (the largest greenhouse gas); that will then increase atmospheric warming; that will then warm the Earth's surface; and, etc., in a repeat-the-above scenario of a never-ending positive feedback loop finally leading to the mythical, catastrophic climate tipping points.