Climate change is caused by an increase in the amount of carbon dioxide and other gases like methane and nitrous oxide in the atmosphere. They’re called greenhouse gases because they trap heat from the sun. As humans emit more of these gases into the air, the trapped sunlight warms our atmosphere.
In Ontario, greenhouse gas emissions come from many sources. Emissions mainly come from burning fossil fuels for transportation, from industry, and from the energy needed for commercial and residential buildings. Other emissions also come from the agricultural sector, waste disposal, and electrical generation.