The Best of Alsup

1. What caused the various ice ages (including the “little ice age” and prolonged cool periods) and what caused the ice to melt? When they melted, by how much did sea level rise? 
2. What is the molecular difference by which CO₂ absorbs infrared radiation but oxygen and nitrogen do not? 
3. What is the mechanism by which infrared radiation trapped by CO₂ in the atmosphere is turned into heat and finds its way back to sea level? 
4. Does CO₂ in the atmosphere reflect any sunlight back into space such that the reflected sunlight never penetrates the atmosphere in the first place? 
5. Apart from CO₂, what happens to the collective heat from tail pipe exhausts, engine radiators, and all other heat from combustion of fossil fuels? How, if at all, does this collective heat contribute to warming of the atmosphere? 
6. In grade school, many of us were taught that humans exhale CO₂ but plants absorb CO₂and return oxygen to the air (keeping the carbon for fiber). Is this still valid? If so, why hasn’t plant life turned the higher levels of CO₂ back into oxygen? Given the increase in human population on Earth (four billion), is human respiration a contributing factor to the buildup of CO₂? 
7. What are the main sources of CO₂ that account for the incremental buildup of CO₂ in the atmosphere? 
8. What are the main sources of heat that account for the incremental rise in temperature on Earth?

Now the bunny is more than fond of his answer to question 2, and as long as it is, Eli will book no contradiction on the point.  For question 3 Eli nominates John Nielsen-Gammon in a comment at Real Climate which has the virtues of being concise, clear and complete.

Q3: What is the mechanism by which infrared radiation trapped by CO2 in the atmosphere is turned into heat and finds its way back to sea level?  

A3: The extra heat at sea level comes from the Sun. CO2 reduces the rate at which the atmosphere loses its energy to space via infrared radiation, which in turn reduces the flow of energy from the Earth’s surface to the atmosphere.  

Energy from absorbed sunlight at sea level is transferred from the Earth’s surface to the atmosphere through direct heat exchange, evaporation, and exchange of infrared radiation. All three of these mechanisms slow down if the atmosphere is retaining extra energy, as it does if greenhouse gas concentrations increase.  

The resulting accumulation of energy from the Sun raises temperatures throughout the climate system. A warmer atmosphere is able to lose more energy to space, so the whole climate system eventually approaches a warmer equilibrium.

So what are the bunnies favorites and who won the boobie prizes?