When you bite that sandwich you don't only consume calories, but also all the energy used for the production of its ingredients. Think about it: the cost entailed is far higher that just 2.99 euros.
To know more, here is a video prepared by STOA Science and Technology Options Assessment. (http://www.europarl.europa.eu/stoa/)
https://www.youtube.com/watch?v=uAybZOfCN6g
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If you also want to know your environmental footprint check this out too
http://footprint.wwf.org.uk/
So, next time you eat something, you might as well think about your footprint trails left behind...
