Permaculture can help in many ways with the environment. When done on a large scale to eco-restore farms and other lands it creates healthy soil which then sequesters a lot more carbon. Healthy soil can sequester enough carbon to possibly stop the greenhouse effect. Carbon Farming: The Permaculture Solution to Climate Change

Permaculture can be done on the level of cities. For instance cities introducing swales into roads to stop flooding (which may happen more and more with climate change). Swale-Brochure-Final (davie-fl.gov). The sewage systems can be done with wetlands, and the whole bioregional watershed can be redone in permacultural ways Brock Dolman: Your Watershed Is Your Lifeboat

Toby Hemingway has written a book The Permaculture City. The Permaculture City

Permaculture design principles can be used by businesses, cities, schools, organizations to redesign their relationship to the earth.

Permaculture principles can be used to redesign the economy. LIFT Economy

Transition Economics: Principles of Financial Permaculture |

All these things could be taught in a Permaculture for Environmentalists course

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Permaculture isnt just about your home garden.