The statistics are deeply worrying. Nearly half the earth's agricultural land—about 6 billion acres—is used to grow crops to feed animals; about 45% of that goes simply to feeding chickens. And since agriculture emits about 25% of total carbon dioxide, the cost in terms of climate change is significant. Then there are the oceans: About 22% of all fish caught is ground up for fish meal, whose world price has risen about 500% since 2000, as the oceans' fish stocks decline.
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