AM, Well said.  But remember that photosynthesis was created by God.  I would suggest we look at "what else" we are doing that negatively impacts the earth:  poor water management, poor farming techniques, deforestation, unnecessary consumption, excessive waste, etc.  As an engineer, I look to what can be corrected in the shorter term.  I look at the negative effects of energy poverty.  Affects of CO2 are minimal and are not linear, they diminish with each incremental increase (a curve).  Water vapor is the greatest greenhouse gas and one that we cannot change.  Would God create an environmental so fragile that by using the gifts He gave us we could destroy His creation?