The Science of Climate Change

Key Messages

  • Warming over the 20th century is indisputable and largely due to human activities.
  • Canada’s rate of warming is about twice the global rate: a 2ºC increase globally means a 3 to 4ºC increase for Canada.
  • Effects will persist for centuries because greenhouse gases (GHGs) are long-lived and the oceans are warming.
  • Cumulative CO2 emissions largely determine ultimate warming. A 2ºC warming target may still be attainable, but we are already 65% of the way to the associated carbon limit or budget and global emissions must peak before mid-century.
  • GHG emissions need to become net zero in order to stabilize climate at any temperature.

    This is a graphic logo for Environment and Climate Change Canada.
Graphic Source: Environment and Climate Change Canada
Published date: 
November 23, 2015
Environment, Water and Climate Change

General Inquiries

Department of Environment, Water and Climate Change
4th Floor, Jones Building
11 Kent Street
PO Box 2000
Charlottetown, PE C1A 7N8

Phone: 902-368-5044
Toll-free: 1-866-368-5044
Fax: 902-368-5830
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