| System or friendly preceder | 27 |
| Start of a Sierra Club tour? | 28 |
| Start for type or tourism | 25 |
| Prefix with warrior and type | 28 |
| Prefix with toxicology | 22 |
| Prefix with tour or type | 24 |
| Prefix with sphere or system | 28 |
| Prefix with law or tourist | 26 |
| Prefix with freak or friendly | 29 |
| Prefix with efficiency | 22 |
| Prefix with catastrophe | 23 |
| Prefix with car or warrior | 26 |
| Prefix with car or law | 22 |
| Prefix for system or type | 25 |
| Prefix for nomy or logy | 23 |
| Prefix for logy or nomy | 23 |
| Prefix for logy and nomics | 26 |
| Popular 90's essayist | 25 |
| Novelist from Piedmont | 22 |
| Non-polluter's prefix | 25 |
| Modern prefix with village | 26 |
| Modern prefix with tourism | 26 |
| Modern prefix with friendly | 27 |
| Modern prefix with balance | 26 |
| Letters for green jobs | 22 |
| Lead-in for system or species | 29 |
| Kind of freak or system | 23 |
| It can mean "green" | 29 |
| Green, in combinations | 22 |
| Good prefix for Earth Day | 25 |
| Environmentally minded | 22 |
| Environmentally concerned | 25 |
| Environmental-related prefix | 28 |
| Environment: Comb. form | 23 |
| Earth-friendly lead-in | 22 |
| Earth-friendly beginning | 24 |
| Citizen ___-Drive watches | 25 |
| Beginning of many green words | 29 |
| "Green": Prefix | 25 |
| "Baudolino" writer | 28 |
| ___ Mode (Prius button) | 23 |
| Zero-emission vehicle, e.g. | 27 |
| Environmentally friendly auto | 29 |
| Chevy Volt or Nissan Leaf | 25 |
| Chevy Volt or Ford Fusion | 25 |
| "Green" vehicle | 25 |
| "Green" sci. | 22 |
| Sierra Club concern: Abbr. | 26 |
| Environmentalist's subj. | 28 |
| Environmentalist's sci. | 27 |
| Environmental science: Abbr. | 28 |
| Type of bioscience: Abbr. | 25 |
| Tree-hugger's subj. | 23 |
| Tree hugger's subj. | 23 |
| Subj. for nature lovers | 23 |
| Subj. for a forest ranger | 25 |
| Subj. concerned with habitats | 29 |
| Study of environment: Abbr. | 27 |
| Science subject: Abbr. | 22 |
| Sci. of the environment | 23 |
| Sci. for conservationists | 25 |
| Renewable energy subj. | 22 |
| Rachel Carson's sci. | 24 |
| Naturalist's subj. | 22 |
| Kyoto Protocol concern: Abbr. | 29 |
| Green's concern: Abbr. | 26 |
| Green party focus: Abbr. | 24 |
| Green party focus (abbr.) | 25 |
| Green Party cause: Abbr. | 24 |
| Forester's concern: Abbr. | 29 |
| Food-chain discipline: Abbr. | 28 |
| EPA's concern, briefly | 26 |
| Environmentalists' subj. | 28 |
| Environmentalist's maj. | 27 |
| Environmentalism: Abbr. | 23 |
| Earth-friendly coll. course | 27 |
| Earth science, for short | 24 |
| Earth Day subject: Abbr. | 24 |
| Branch of biology: Abbr. | 24 |
| Area of E.P.A. purview: Abbr. | 29 |
| Élève's place | 24 |
| Élève's milieu | 25 |
| Professeur's place | 22 |
| French place of learning | 24 |
| Place for élèves | 22 |
| Élève's school | 25 |
| Where to learn une leçon | 27 |
| Where élèves study | 24 |
| Place for an élève | 24 |
| Lycée's relative | 23 |
| French place of education | 25 |
| Place for a professeur | 22 |
| Place for a French lesson | 25 |
| Instituteur's institution | 29 |
| ___ des Beaux-Arts, Paris | 25 |
| Where to study en français | 29 |
| Where to learn histoire | 23 |
| Where to learn anglais | 22 |
| Where to get an éducation | 28 |
| Where grammaire is taught | 25 |