The Science

I'm never going to be drawn into a 'debate' about climate change. The science is settled.
Climate change is real, and a profound threat to civilisation as we know it. 

 How do I know that? Because I value and respect the work of scientists. 
If you are confused, or uncertain, then you are probably misinformed.

The following organizations provide scientific evidence and clear statements that:
1) Global Warming / Climate Change is real.
2) Human activities are by far the largest cause
3) Global Warming / Climate Change is an ongoing and worsening phenomenon.

The Australian Meteorological and Oceanographic Society

National Aeronautic and Space Administration (NASA)

National Oceanic and Atmospheric Administration
World Meteorological Organization (WMO)
American Meteorological Society
National Center for Atmospheric Research
Earth System Research Laboratory - Global Monitoring Division (US Dept of Commerce)
American Geophysical Union (world's largest scientific society of Earth and space scientists)
American Association for the Advancement of Science
U. S. National Academy of Sciences
National Science Foundation
U. S. Geological  Survey

• “Glacier and Landscape Change in Response to Changing Climate”
• Time lapse video: “Glacier Erasure: South Cascade Glacier in a Changing Climate”

Geological Society of America
United Nations Environment Programme/World Glacier Monitoring Service
Massachusetts Institute of Technology

National Snow and Ice Data Center - Global Glacier Recession
“We live in a time of increasing greenhouse gas concentrations with an attendant warming of the climate.”
http://nsidc.org/glims/glaciermelt/

The United States Energy Information Administration
“Greenhouse Gases, Climate Change, and Energy”
http://www.eia.doe.gov/bookshelf/brochures/greenhouse/Chapter1.htm

California Institute of Technology
“How We Know Global Warming is Real”
“The science behind human-induced climate change”
http://www.gps.caltech.edu/~tapio/papers/skeptic_2008.pdf

Stanford University
“Global warming . . . is now well documented and accepted by scientists as fact.”
http://solar-center.stanford.edu/sun-on-earth/glob-warm.html

Atmospheric Sciences - University of Illinois - Champaign
“Evidence continues to mount that human activities are altering the Earth’s climate on a global scale.”
http://www.atmos.uiuc.edu/research/01climate.html

Woods Hole Oceanographic Institution
“Global Warming”
http://www.whoi.edu/page.do?pid=12457

Scripps Institution of Oceanography (University of California - San Diego)
http://scripps.ucsd.edu/img/climate_flyer.pdf

The UK’s Met Office Hadley Centre
“Climate change - the big picture”
http://www.metoffice.gov.uk/corporate/pressoffice/myths/index.html
http://www.metoffice.gov.uk/climatechange/guide/

The UK’s Royal Society
“Climate change controversies: a simple guide”
http://royalsociety.org/page.asp?id=6229

Intergovernmental Panel on Climate Change 
“Climate Change 2007: Synthesis Report”
http://www.ipcc.ch/pdf/assessment-report/ar4/syr/ar4_syr_spm.pdf

Japan Meteorological Agency
“Global Warming Projection Vol.7”
http://ds.data.jma.go.jp/tcc/tcc/products/gwp/gwp7/index-e.html

National Geographic Magazine
http://environment.nationalgeographic.com/environment/global-warming/

Scientific American Magazine
http://www.sciam.com/topic.cfm?id=global-warming-and-climate-change

Have you seen the movie "The Great Global Warming Swindle" and believed some or all of it?
Here's a robust expose of the lies it contains, and the agenda and character of its producer: (link)