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Climate change refers to the variation in the Earth's global climate or regional climates over time. It describes changes in the variability or average state of the atmosphere—or average weather—over time scales ranging from decades to millions of years. These changes may come from internal processes, be driven by external forces or, most recently, be caused by human activities.
In recent usage, especially in the context of environmental policy, the term "climate change" is often used to refer only to the ongoing changes in modern climate, including the rise in average surface temperature known as global warming. In some cases, the term is also used with a presumption of human causation, including in the United Nations Framework Convention on Climate Change (UNFCCC). The UNFCCC uses "climate variability" for non-human caused variations*.
For information on temperature measurements over various periods, and the data sources available, see temperature record. For attribution of climate change over the past century, see attribution of recent climate change.
More on [ Climate change ]
Weather :: Canada
Global Warming
In Reversal, New Orleans Lets Residents Return
Thu, 04 Sep 2008 08:09:52 -0000
As people began trickling back to the city, utility officials gave no word on when electricity would be restored.
Palin Assails Critics and Electrifies Party
Thu, 04 Sep 2008 13:51:00 -0000
Gov. Sarah Palin of Alaska sought to wrest back the narrative of her life as she introduced herself to a roaring crowd at the Republican National Convention.
Damaged Power Lines Blamed for Wildfires
Thu, 04 Sep 2008 10:32:57 -0000
A report blamed two companies for some of the most devastating wildfires in Southern California last year.
Christian Science Monitor | Top Stories
Gustav holdouts' tales give evacuees pause
Their experiences could provide valuable lessons about evacuation versus staying put.
Reported U.S. attack upsets Pakistan
US forces may have sent in ground troops for the first time Wednesday. Were they targetting a top Taliban or Al Qaeda figure?
This round, Pentagon may keep General Petraeus offstage
As his next report on troop levels nears, senior officers aren't sure they'll agree.
Canadian Foundation for Climate and Atmospheric Sciences - Funds research that improves the scientific understanding of processes and predictions. Provides description of services, projects and links.
Climate Change - Government of Canada web site provides background information and resources on global climate change. Issues, actions and resources.
Meta Description: [ On the Government of Canada Climate Change web site you can learn about the science, impacts and adaptation to climate change and how you can take action by reducing your greenhouse gas emissions. Take action on climate change! ]
Greenhouse Gas Action Guide - Easy actions to reduce greenhouse gas emissions, for municipalities and first nations. Provides listing of resources and programs available.
Meta Description: [ Easy actions to reduce greenhouse gas emissions, for municipalities and first nations in British Columbia. ]
National Climate Change Secretariat - Created to inform Canadians about the process of developing a national implementation strategy on climate change. Provides information, news and resources.
Stop Climate Change - Canadian Climate Quiz and actions to take for clean air. One of the major programs of the David Suzuki Foundation.
Meta Description: [ The David Suzuki Foundation is a science-based Canadian environmental organization, working to protect the balance of nature and our quality of life, now and for future generations. ]
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