When we need to "consume", we should be buying stuff that uses as little water and electricity as possible. Comparing the different products for these attributes can be difficult. Here are the best resources:
Searchable Canadian Government Energy Efficiency Ratings of all available:
The (user-unfriendly) master page is here. I always have trouble finding these databases, so I thought that I would post them here for easy reference. After you've run your initial search, click on "Energuide Rating (kWh/year)" twice. This will order the appliances by the smallest consumption first.
For cars, if you simply must buy one, refer to the U.S. Government's Fuel Economy comparison website.