Yes, global climate change is definitely man-made. The most prominent reason is that most of the energy we depend on is coming from the fossil fuels and its burning produced carbon dioxide, the main cause for global climate change. Another reason is that forests are disappearing because of many purposes for human life. Without strong change in our energy source and use, global climate change will get worse.
Man made climate change is real and a threat. As sure as the sun rises man made climate change is real and a threat. I've talked to many climate change deniers and they haven't even watched inconvenient truth. They just go to a website or video that attacks inconvenient truth and dismiss Al Gore's documentary w/o watching it. Many of their arguments are misleading or blatantly false. Why use such crappy arguments? Only reason I can think of is to stall so big corporations make more money.