Sustainably means in a way that can be kept up without using things up. Fish sustainably.
The test is whether it could go on for ever, which almost nothing passes. Working sustainably applies to people as much as to forests, and is ignored in both.
1adverbsustainablyIn a way that can be kept up without using things up.
“The forest has been worked sustainably for four hundred years.”
sustainably is a manner.
From sustainable + -ly.
Etymology from Wiktionary, CC BY-SA