9780521407441c03 39..67

http://www.pik-potsdam.de/~stefan/Publications/Book_chapters/archer_rahmstorf_chapter3.pdf

Measurements unequivocally show that we are in the midst of an accelerating global warming: temperatures have increased on global average by 0.8 C since the late nineteenth century, and by 0.6 C since the 1970s.  

---SPSmith