In order to prevent slighter better weather from killing your grandchildren, why not eat food that other people have thrown in the garbage?

Money can’t buy me sustainability « Climate Progress

But an increasing number of people have turned to no-cost solutions when acquiring home furnishings, clothes, food, and other necessary items. In doing so, they’re keeping items out of landfills, cutting the carbon it takes to manufacture new products, and generally living a more sustainable lifestyle.
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Freeganism’s central practice is dumpster diving, which tends to draw mixed reactions. Grocery stores and restaurants toss plenty of perfectly edible, often unopened food on a daily basis, and freegans rummage through these establishments’ dumpsters for groceries. But people don’t just go dumpster diving for food. They also get furniture, clothes, home furnishings, and a myriad of other valuables from piles of other peoples’ refuse. Knowing when and where to go dumpster diving is a kind of art to these environmentalists.