Main Hypothesis: Carbon Dioxide acts as a thermal blanket on the Earth, causing significant warming to the point of our destruction.
This hypothesis is untestable, and has been supported only by the rising temperatures. The 'story' is that this happens on other planets as a 'greenhouse gas'. Early work in the laboratory showed that carbon absorbs and emits a notch of the infrared spectrum and this has been worked up with a mechanism that has not been tested in the field.
nasa's big crime is not coming up with a silly story, but actively ignoring simple tests.
Hypothesis One: Carbon Dioxide acts as a greenhouse gas. In other words, more carbon interferes with the normal release of heat energy to outer space.
This has been tested with weather balloons. There is no evidence of a greenhouse gas working, and the 'lapse rate' or decrease of temperature with height is totally determined by convection.
However, it appears that this bit of evidence is easily ignored. Why? Because it is not direct. The direct way is to actually measure the amount of interference. This can be easily done with lasers on a balloon. Nasa actually mounted lasers on a balloon, but aimed them all up, to study upper convection.
The actual concentration of carbon dioxide varies with time over the whole world. The interference can be directly measured, and a value assigned to the 'Carbon Coefficient'.
-to be continued (I don't think I have 5 yet) :)