One Day is the City of Vancouver’s community engagement process in support of its Community Climate Change Action Plan. One Day is about taking small steps to make Vancouver the cleanest, greenest, healthiest planet in the world. The City has been working for the past 18 months to change the way City operations use energy. Now, it’s the community’s turn to do its part. By making small changes in our homes and how we move around the city, we can play a big part in reducing energy consumption and cutting down on harmful emissions.