Thermometer on a windowClimate change – long-term change in Earth’s weather patterns – is arguably the most significant crisis humanity has ever faced. Extreme heat, flooding, drought, violent storms, rising sea levels, habitat loss, worsened smog, and many more impacts all combine to create an enormous environmental, social and economic challenge.

Over the past 200 years, humans have been the major cause of climate change. Burning fossil fuels (such as coal, oil and natural gas), as well as deforestation, has released huge amounts of “greenhouse gases” (GHGs), like carbon dioxide and methane, into the atmosphere, trapping energy and increasing global temperatures.

Ontario is expected to see an increase in annual average temperature of 1.5 to 7°C in the south of the province and 10°C in the Far North by the 2080s.

Some of the projected impacts of climate change in Ontario include:

  • Disruptions to critical infrastructure, including water treatment and distribution systems, energy generation and transmission and transportation due to more frequent extreme weather events;
  • Lower Great Lakes water levels, which could compromise shipping and reduce hydroelectric output;
  • More frequent water shortages, as summer temperatures and evaporation rates increase;
  • Greater risks to public health from injury, illness and premature death from climate-related events such as extreme weather, heat waves, smog and the spread of diseases;
  • Increased risk for remote and resource-based communities, which are already severely affected by drought, ice-dam flooding, forest fires and warmer winter temperatures; and
  • Damage to Ontario’s ecosystems, through the combined influence of changing climate, human activities and natural disturbances like fire, outbreaks of insects and disease.

In Ontario, the primary responsibility for action on climate change is the Ministry of the Environment, Conservation and Parks (MECP).

ECO Reporting on Climate Change

Since 2009, the Environmental Commissioner of Ontario (ECO) has had a statutory responsibility to report annually on Ontario’s progress towards reducing its GHG emissions. Accordingly, we produce a Greenhouse Gas Annual Progress Report (the “GHG Report”) each year.

In addition to the ECO’s annual reporting on GHG emissions by sector, the ECO has reported on a number of climate-related issues, including: the science of climate change; carbon pricing; metrics and data verification; governance and policy; the risks and costs of climate change; and adaptation and possible GHG mitigation solutions. Below is a selection of the ECO’s reports and articles on climate change. You can also use the search bar at the top of this page to search our website and reports for a particular word or phrase.

Special Reports and Publications
Annual GHG Reporting

Issue-Based Articles

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