True. We don't know everything about our planet's climate. However, we do know that CO2 retains higher amounts of heat than normal atmospheric conditions. By adding more CO2 to the atmosphere, we're forcing the atmosphere to retain more heat from the Sun, thereby increasing atmospheric temperature. I don't disagree. We need to do more research, but limiting our impact on the environment may be better in some cases. In other cases, such as using livestock to mimic wild herds that are now gone, we can have a positive environmental impact that benefits all parties. Just... make sure all that methane doesn't mess up the atmosphere, either. Yeah, we have a long, long way to go before we can understand everything.