Tomato debate

I know a couple of people that don't like tomatoes -weird I know. But taste is different for all.
You could say as a general statement that tomatoes are the most popular vegetable/fruit.  They are easy to prepare, good for you and quite versatile. Here in Canada due to the cold climate and short summer they cannot be grown very easily.  for most of the year we need to rely on greenhouses.
I ask myself: is it more energy efficient to grow a tomato in a greenhouse here locally or to use the energy from the sun to grow tomatoes in California and Mexico and then transporting them all the way here?  I could not find a clear answer.  A similar research from Sweden found out that growing tomatoes in Spain for sale in Sweden needed less energy use than a local greenhouse.  However Canada and California/Mexico are much further apart than Spain and Sweden.  You can find more info about this study at http://www.worldwatch.org/node/6064

Other things to consider are the lower use of pesticides in greenhouses and possible higher water needs to grow vegetables in more arid places.

 It's a bit of a dilemma.  I would suggest to limit your environmental footprint by eating more tomatoes in the summer months when local tomatoes are available. If you have a sunny spot on your balcony or garden you can grow  tomatoes easily.  For us here in British Columbia tomatoes are growable if a small plant is purchased in early May and placed outdoor with lots of rich soil under a homemade greenhouse - a tight clear plastic screen will suffice.  Your home-grown tomatoes will show you what a good tomato should taste like. It is not worth to buy bland watery tomatoes in the cold months.

We should enjoy food and prepare it with care but also remember that it comes from somewhere and that within the scope of "reasonable" we should try to buy food that is safe to eat, grow and transport.

I personally prefer regular field tomatoes grown in fields.  I find they have a more solid texture and usually better flavor.  If I buy local greenhouse tomatoes it's the sweet grape tomatoes.
What do you think or know about the energy-efficiency of tomato growing? Feedback is very welcome!