When Eldon suddenly realizes that air pollution around his office has become a real problem, Sid and Idee set out to learn how some great ideas are being used to combat pollution in Canada's most populated areas. First, they head to the Scarborough Bluffs, where Michael D'Andrea, Director, Infrastructure Asset, Planning & Management, Toronto Water along with kid correspondent, Elisa, demonstrate how the only Dunkers Project in Canada is being used to safely and naturally treat polluted rainwater before it goes back into Lake Ontario. Next, our adventurers brave downtown Toronto where skyscrapers are using the cold water of Lake Ontario instead of fossil fuels to power their air conditioning systems. Enwave CEO Dennis Fortinos and kid correspondent Kathryn take Sid and Idee underneath Toronto's downtown core to demonstrate how it works. Then it's off to the Torrance Barrens, Canada's first Dark Park Reserve. Jan McDonnell, Wildlife biologist, Ministry of Natural Resources helps our adventurers learn about light pollution and how steps are being taken to bring back the beauty of the night sky. It's one great idea for the environment after another.