In order to be environmentally friendly you are supposed to buy local. This doesn't just mean local produce but local everything (or at least as much as possible). The basic idea is that the less shipping and transport that is required to deliver a product to your home the lower the carbon footprint of that product.
Part of the problem with this is that it is hard to know exactly what is made local. Very few products advertise where they are made. A new website called madelocal.org has launched to try and help people find local products and help local producers find products. Only a few products are listed on the site so far - (5 for Nova Scotia and 1 for Quebec) to be exact. So if you know of great local products, or if you yourself are a Canadian producer of stuff, go visit madelocal.org and click on the 'submit a local product' link at the top of the page.