The Earth Party puts the planet first, because without it, nothing else can even be debated. The health of the ecosystem is one of the Law's Three Affirmations of Sanity.
The Prime Directive is simple: let the planet be. Don't reduce the land's living surface, its variety of species, or the purity of its soil, water, and air, unless survival genuinely requires it, no less harmful way exists, and the people of the place have held council to confirm both.
Some harms are beyond any council's authority to approve: fracking, strip mining and mountaintop removal, dams that drown whole ecosystems, new nuclear reactors, and weapons of mass destruction. Fossil fuels may power civilization only temporarily, until clean energy matures, and never for economic growth.
Land deprived of its natural forest, and serving no useful purpose for the community, must be allowed to grow back. And where money is created, it should reward the work that heals the Earth. (The Multi-Layered Economy.)