The data that the globe is warming is irrefutable. That doesn’t keep the hard core deniers from questioning it but questioning the data doesn’t refute it. So, if man hasn’t been the cause of this warming, what has? I’ve heard a lot of people mumble stuff about it being natural for the climate to change but that isn’t an explanation. An explanation would tell exactly what has changed in order to cause the current warming. Solar output isn’t up. The Earth’s orbit is not changing. The Earth’s tilt isn’t different. So, rather than say that the warming isn’t caused by man, tell me what it is being caused by and show your data, and submit it for peer review.