Encyclopedia of Paleoclimatology and Ancient Environments - Google Books

https://books.google.de/books?id=yRMgYc-8mTIC&pg=PA63#v=onepage

Concern exists over human-generated increases in atmospheric greenhouse gases and their potential consequences to society. The Intergovernmental Panel on Climate Change (IPCC) in 2007 finds that global temperatures have increased by 0.8oC since 1850 and…