I'm personally not convinced either way as to whether humans are to blame or not. Sure CO2 levels are rising but gases such as methene/methane are 3 times worse than carbon dioxide at pollouting and thats produced naturally by most animals when pass wind. I think it stems from human ego that us [humans] are the cause of this increase. Perhaps, like the dinosours before us, it will soon be time to become extinct and allow other species to flourish?