Here are a number of links for anyone who wants to gain some insight into the causes and effects of climate change.
An inconvenient truth
http://www.climatecrisis.net/
The carbon fund
http://www.carbonfund.org/
Earthshare
http://www.earthshare.org/
United Nations Environmental Program Climate Change Program
http://unep.org/themes/climatechange/
WWF - The World Wildlife Fund - Climate Change
http://www.panda.org/about_wwf/what_we_do/climate_change/index.cfm
Climatechange.org
http://climatechange.org.za/
The US Environmental Protection Agency Climate Change page
http://www.epa.gov/climatechange/
The Australian Government - Bureau of Metereology
http://www.bom.gov.au/climate/change/
Greenpeace Climate Change Campaign
http://www.greenpeace.org/international/campaigns/climate-change
BBC Climate change site
http://www.bbc.co.uk/climate/
United Nations Framework Convention on Climate Change
http://unfccc.int/2860.php
Department of Environmental food and rural affairs - Climate and Energy
http://www.defra.gov.uk/ENVIRONMENT/climatechange/index.htm
European Environmental Agency - Climate Change Site
http://www.eea.europa.eu/themes/climate
The World Bank
http://web.worldbank.org/WBSITE/EXTERNAL/TOPICS/ENVIRONMENT/EXTCC/0,,menuPK:407870~pagePK:149018~piPK:149093~theSitePK:407864,00.html
Climate research
http://www.climateresearch.net/
The Intergovermental Panel on Climate Change
http://www.ipcc.ch/
The Wikipedia definition
http://en.wikipedia.org/wiki/Climate_change
The World Health Organization
http://www.who.int/globalchange/climate/en/