Some posters have claimed that there is "debate" over the cause of Global Warming being human in origin. Amongst those that claim it is a natural phenomenon are those that claim that climate change is due to solar activity.
However whilst this may be true in a historical context, data of solar activity shows that solar activity has not reflected climate change for the past 30 years. The latest edition of New Scientist states precisely this.
www.newscientist.com