Ottawa is not a very sustainable city, there is constant traffic, garbage in the streets and ditches and there is little if no forms of renewable energy used. By just looking at places like Amsterdam or Sweden it's very clear that Ottawa is not up to par.
For starters Ottawa can focus on putting into place laws/regulations that force people in the city to recycle or compost their waste. As for other waste that doesn’t fall into those categories, similar to Sweden, Ottawa can send that other waste to a plant that helps clean out the gas being put off and sent into the atmosphere.
Ottawa could make the switch to using bikes as their main source of transportation, but because winters bring lots of snow, having bikes is not the most practical thing. Many people who work in Ottawa don’t actually live in Ottawa as well so having bikes as the main form of transportation would not be very practical for them as well. Ottawa, instead, could introduce busses run off of bio fuel, a gas made from old garbage, or electric vehicles, and this would still allow people not in the city to get into work.
Charging stations (for electric cars) may pose as a bit of an issue to implement but I believe that if Ottawa wants to become a more sustainable city they would need to convert to electric cars.
To reduce the use of harmful forms of energy, such as petrol, Ottawa can use more renewable resources such as solar energy to help reduce the levels of emission being let out.
I believe that these sustainable practices will be fairly easy to implement, and although some of them may cost a high amount of money in the long run they will definitely be worth it.