There's a link to a main article in it that discusses the various organizations that have voted among their members to endorse it. These include some of the most prestigious scientific associations in the world. The national science academies of the G8, along with their counterparts in Brazil, China, and India, the three largest producers of greenhouse gases in the developing world, all endorse it. The US National Research Council endorses it. The American Meteorological Society endorses it. The American Geophysical Union and American Institute of Physics endorse it. The US National Academy of Sciences endorses it. The Australian Academy of Sciences, Royal Flemish Academy of Belgium for Sciences and the Arts, Brazilian Academy of Sciences, Royal Society of Canada, Caribbean Academy of Sciences, Chinese Academy of Sciences, French Academy of Sciences, German Academy of Natural Scientists Leopoldina, Indian National Science Academy, Indonesian Academy of Sciences, Royal Irish Academy, Accademia Nazionale dei Lincei (Italy), Academy of Sciences Malaysia, Academy Council of the Royal Society of New Zealand, Royal Swedish Academy of Sciences, and Royal Society of Britain all endorse it.
The biggest problem is that organizations that don't endorse it always seem to rely on energy companies, a high percentage directly or indirectly on Exxon, for their funding. This creates at least the appearance of impropriety, whether the reality is there or not. To quote the Wikipedia article,
"The only major scientific organization that rejects the finding of human influence on recent climate is the American Association of Petroleum Geologists."
I don't think there's a great deal more to be said. It's happening, and we did it and are doing it. That's a heckuvalot of scientists in those organizations I named up there. Sure, there's dissent; there always is. Some is honest, some is hypocritical, some is intended to be deceptive. It's never unanimous. But in the strong opinion of the overwhelming majority of scientists, and an even higher majority of the scientists qualified to hold an opinion, there is no more question and has not been for over a decade.