But the SAD wreaks havoc on way more than health-care costs: It degrades the environment, arguably an even bigger issue than obesity-related disease. The industrial production of animal products and hyper-processed food creates devastating by-products, from greenhouse gas emissions to land degradation to polluted water supplies. It’s commonly acknowledged that livestock production is one of the top two contributors to greenhouse gas emissions, accounting for at least 20 percent (and by some estimates up to 50 percent) of dangerous gases in the atmosphere—a greater impact than even
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