I can consume energy coming from clean sources like nuclear (focusing on the CO2) and renewable and I can also consume energy coming from coal power plants. Same thing with many other resources. I can order from Amazon a pen-drive with frustration free packaging which is also less garbage production and I can order the regular one which has insane amount of garbage for no good reason. I can use LED lights or normal ones. People can be smart about consumption. That is the biggest impact on CO2 production, not something like a piece of paper signed by politicians. That is my point.