Genetically Modified to Save the Planet: Is the Enviropig What's for Breakfast?

Can we use genetics to make farm animals greener than nature intended? Scientists are certainly trying--just take a look at the Enviropig, a genetically engineered pig that produces feces and urine containing 65% less phosphorous than standard porkers. National Geographic reports that the pig was recently approved for Canadian production in controlled research settings. Next up: passing tests in the U.S and Canada for commercial use.

Enviropig's creators didn't tweak pig genes just for...