True. And specifically that it is serious, unprecedented, driven mainly by human activity, and requires appropriate action. See statement at
endorsed by the [US] National Academy of Sciences, Chinese Academy of Sciences, Indian National Science Academy, , Russian Academy of Sciences, Royal Society (London). Over 40 other academies of national stature have issued similar statements:
Thirty years of watching the evidence accumulate. Look in SCIENCE or NATURE, or even Wikipedia Global warming, for extensive real peer-reviewed scientific research.
See eg The Hot Topic, Dvd King, Prof. Cambridge (now Oxford); Global Warming 4th ed. 2009, John Houghton, Prof. AtmosphericSci., Oxford