| Grp. overseeing toxic cleanups | 30 |
| Grp. monitoring emissions | 25 |
| Grp. involved in a cleanup | 26 |
| Grp. concerned with pollution | 29 |
| Grp. concerned with m.p.g. | 26 |
| Green-minded org. | 17 |
| Green org. with a floral logo | 29 |
| Green monitor, for short? | 25 |
| Green agcy. | 11 |
| Gp. that rates | 14 |
| Gp. concerned about emissions | 29 |
| Govt. pollution watchdog | 24 |
| Govt. org. in 'The Simpsons Movie' | 42 |
| Govt. ecology office | 20 |
| Govt. antipollution org. | 24 |
| Govt. air-quality watchdog | 26 |
| Govt. air monitor | 17 |
| Govt. agcy. with a "sustainable practices" section on its website | 75 |
| Govt. "cleanup" agency | 32 |
| Government org. since 1970 | 26 |
| Government agcy. est. in 1970 | 29 |
| Gov't air checker | 21 |
| Gas-mileage grp. | 16 |
| Gas mileage grp. | 16 |
| Fuel economy authority, for short | 33 |
| Frequent GOP debate target | 26 |
| Federal PCB banisher | 20 |
| Federal org. with a flower in its logo | 38 |
| Federal org. with a "personal greenhouse gas emissions calculator" | 76 |
| Federal org. issuing standards | 30 |
| Federal ecology agency | 22 |
| Federal agcy. since 1970 | 24 |
| Fed. watchdog created by Nixon | 30 |
| Fed. pollution watchdog | 23 |
| Fed. pollution group | 20 |
| Fed. enforcer of air quality standards | 38 |
| Fed. conservation org. | 22 |
| Fed. clean-air watchdog | 23 |
| Fed. air monitor | 16 |
| Fed. agency since 1970 | 22 |
| Factory-emissions testing grp. | 30 |
| Evil org. in "The Simpsons Movie" | 43 |
| Environmentalists' org. | 27 |
| Environmental watchdog agcy. | 28 |
| Environmental protection grp. | 29 |
| Environmental protection org. | 30 |
| Environmental grp. | 18 |
| Environmental org. | 19 |
| energystar.gov org. | 19 |
| ENERGY STAR promoter, briefly | 29 |
| Energy Star program creator | 27 |
| Emissions-standards grp. | 24 |
| Emissions-regulating org. | 25 |
| Emissions watchdog, for short | 29 |
| Emissions watchdog org. | 23 |
| Emissions watchdog gp. | 22 |
| Emissions tester: Abbr. | 23 |
| Emissions tester, briefly | 25 |
| Emissions regulator: Abbr. | 26 |
| Emissions org. | 14 |
| Emissions control grp. | 22 |
| Ecosystem monitors | 18 |
| Ecology-oriented govt. group | 28 |
| Ecology-minded agcy. | 20 |
| Ecology org. | 12 |
| Ecology gp. | 11 |
| Ecological agcy. | 16 |
| Ecol. watchdog org. | 19 |
| Ecol. grp. | 10 |
| Ecol. agency | 12 |
| Eco-minded grp. | 15 |
| Eco-friendly govt. agency | 25 |
| Eco-friendly fed gp. | 20 |
| Earth-friendly gp. | 18 |
| Earth Watch etc. | 16 |
| Dump cleanup grp. | 17 |
| DDT-banning org. | 16 |
| DDT-banning gp. | 15 |
| DDT-banning entity | 18 |
| DC water watchdog | 17 |
| D.C. group once headed by Mrs. Burford | 38 |
| Coastline protector | 19 |
| Climate-concerned org. | 22 |
| Clean-air-and-water agcy. | 25 |
| Clean-air gp. | 13 |
| Clean water agcy. | 17 |
| Clean School Bus USA org. | 25 |
| Clean diesel grp. | 17 |
| Clean air and water agcy. | 25 |
| Clean Air Act enforcer: Abbr. | 29 |
| Carol Browner's org. | 24 |
| Car-emissions agcy. | 19 |
| Cap and trade org. | 18 |
| Cabinet-level dept. | 19 |
| Browner's org. | 18 |
| Banner of DDT | 13 |
| Auto-testing grp. | 17 |
| Assessors of mpg | 16 |
| Assessors of m.p.g. | 19 |
| AQI user | 8 |