Which has a bigger (ie. worse) environmental impact: grilling with propane or grilling with charcoal? Taking into account not only the actual process of burning the material itself, but also cost of producing & shipping the fuel, etc.
posted by Saxon Kane on Dec 20, 2008 - 15 answers

How many above-ground nuclear bomb detonations (for testing purposes or otherwise) could human life on Earth realistically hope to withstand? At what point is devastating environmental collapse just an inevitable result of increased carbon-14 levels, or is there such a point? [more inside]
posted by saulgoodman on Jun 12, 2008 - 19 answers

What's so bad about wasting water? [more inside]
posted by ztdavis on Jun 13, 2007 - 41 answers