I don't have a problem with greener alternatives, however, I really don't buy this "sky is falling" attitude.
The climate is not a simple equation to work out and we've been studying it for about the same amount of time we've been producing CO2.
Read up on the
Maunder minimum
Our sun puts out a lot more than just light. If we're the cause for the temperature to rise, why is the temp going up on Mars, Jupiter, Saturn, etc... ?
Jupiter
Mars
Pluto
Somehow I don't think fossil fuels are doing this.
Another Link