| 100% | ENERGY | 6 | Renewable ___, eco-friendly resource that is harnessed via natural sources |
| 38% | CASSAVAS | 8 | Plants that are a natural source of cyanide |
| 36% | AIR | 3 | ___-purifying plants, natural source of reducing pollution that was researched by NASA |
| 33% | BIOMASS | 7 | Renewable energy source which is developed from organic materials that come from plants and animals |
| 32% | WIND | 4 | Renewable energy source that is captured by turbines and converted into electricity |
| 32% | SOLAR | 5 | Renewable source of energy that is derived from the sun |
| 31% | ORES | 4 | Underground resources that are mined and refined |
| 31% | TIME | 4 | Resource that's not renewable |
| 31% | OIL | 3 | A refined resource that is used to cook |
| 31% | OER | 3 | Educational resources that are owned by the public |
| 31% | ACORN | 5 | Resource that might be squirreled away |
| 30% | TAPWATER | 8 | Resource that may be described as "piped" |
| 30% | RENEWABLE | 9 | Resource that can be replaced after being used |
| 29% | ORE | 3 | Resource that needs to be refined to yield metals |
| 29% | BEAN | 4 | Seed that is the source for 20a |
| 29% | SEVENS | 6 | Come out craps rolls that are naturals |
| 29% | ORE | 3 | Natural resource that contains metal |
| 29% | UNOBTANIUM | 10 | Fictional resource that is, true to its name, very difficult to acquire |
| 29% | FOSSILFUEL | 10 | Non-renewable energy source that might be fueling 15-Across: 2 wds. |
| 28% | ITASCA | 6 | Lake that is a source of the Mississippi |
| 28% | NUTMEG | 6 | Evergreen tree that is the source of mace |
| 28% | PINES | 5 | Coniferous trees that are a source of timber |
| 28% | ALE | 3 | Beverage that was a medieval source of nutrition |
| 28% | WATER | 5 | Natural resource constituting oceans and seas that would become non-renewable if not properly conserved |
| 28% | ORE | 3 | Natural rock that can be mined |
| 28% | NATURALGAS | 10 | Resource that is actually virtually odorless and hence, has an odorant added to aid detection |
| 28% | GIBRALTAR | 9 | Strait that is a natural exit in the Mediterranean |
| 28% | GRAPES | 6 | Pulpy fruits that are the main sources of wine |
| 28% | EGG | 3 | Poultry output that is a healthy source of fat |
| 28% | MILCH | 5 | ___ cow (person that is an easy source of profit) |