Certified Emission Reduction Ottawa is a program aimed at reducing greenhouse gas (GHG) emissions in the city of Ottawa, Canada. This program is part of the city's efforts to achieve its Nets2050 target of becoming a zero-emissions city by 2050. As part of this effort, CERs can play a crucial role in offsetting emissions that cannot be reduced through local efforts alone. The city encourages businesses and organizations to invest in CERs to support sustainable development projects in developing countries, while also offsetting their own emissions.