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Save the Planet

Across
Prevention of wasteful use
Coniferous trees
Smallest structural and functional unit of an organism
Earth and Mars, e.g.
4840 square yards
Limbless cold-blooded vertebrate animal with gills and fins
Biological community of interacting organisms and their physical environment
Branch of biology that studies the interactions among organisms and their biophysical environment
Development that meets the needs of the present without compromising the ability of future generations to meet their own needs
Use more than once
Chemical element with atomic number 8
Organic waste as a soil conditioner
Chinook, Coho, Sockeye, Chum, and Pink, e.g.
Natural occurrence of rock or sediment that contains minerals like iron or gold
Down
A marked effect, impression, or impact
Great in size
Feeling or showing gratitude
Convert to another purpose
Greenhouse for 13-Across
Fourth note of the major scale
Not out
Lessen
A male person previously identified
Satisfy
Atlantic, Pacific, Arctic, Indian, and Southern
Avocado dip
Shore
Harmful
Larger
Alike