@Foxfyre,
1.) What evidence do you have to support this? Yes, there could be something but it isn't likely without evidence. The simple measurement of w/m^2 from the sun works to discount this.
2.) What evidence do you have that the amount of water vapor has changed? It might be possible but there is no evidence.
3.) The amount of energy from the sun is capable of being measured. Energy to temperature can be calculated. There are two ways to change temperature, increase energy in or decrease energy out. We can measure the energy from the sun. We can measure the temperature. The energy from the sun isn't enough to account for the temperature increase. That means there are 2 possible explanations.
1. The heat sink is getting warmer so less energy can flow. I don't believe space is getting warmer, do you?
2. The heat transfer coefficient is changing. We know the atmospheric composition is changing which would in turn change the heat transfer coefficient.
I don't know how you think one side has presented a stronger case when you constantly claim you "don't have a clue" about the science.