This week's cartoon describes polyculture -- agriculture that mimics the diversity of natural ecosystems by allowing multiple crops and livestock to thrive in the same space. You'll find more discussions on sustainable agriculture in the Worldchanging archives: for starters, try Jamais Cascio's Agricultural Sustainability = Agricultural Productivity, David Zaks' and Chad Monfreda's Green Water and Sustainable Agriculture, Zac West's Permaculture: Lessons for Urban Living and Louis Fox's Attention Philanthropy Grant to Geoff Lawton and his Permaculture Master Plan.

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Editor's note: This post is part of a series featuring Worldchanging ally Andy Lubershane's original graphics. While many of the issues covered in the comics have been discussed on Worldchanging in the past, we hope that you'll be able to use this new medium in a different way … whether it's in your classroom, on your office wall, or to help explain ideas to friends and family.

Andy Lubershane researches, writes and cartoons about sustainability from his home in Boston. Check out more of his illustrations here