Because here's another one for you: carton (paper), canned (metal), jarred (glass), or pouched (huh?)?
Fortunately, researchers at the Institute for Energy and Environmental Research were brave enough to tackle that one for you.
Their resounding conclusion: based on resource requirements and ecological impact, paperboard cartons are far and away the most environmentally friendly form of food packaging, cutting carbon dioxide emissions and fossil fuel consumption by up to 60% compared with other forms of packaging.
How's that for a takeaway?