decimate - verb
To destroy a measurable or large proportion of.
Note: Originally, decimate meant to select by lot and execute every tenth soldier of a unit. But the current usage of the word, originating in the 19th century, means to destroy a large amount of something. But because of the “one-tenth” sense of the word, careful writers avoid accompanying decimate with percentages, as in Bird flue decimated 80% of the flock. Instead, use destroyed.
The rain forests continue to be decimated. —worldfuturefund.org