4 ms·
What makes 100 years ago a good point of reference? as opposed to a date pre-industrial revolution maybe.
by have_faith 3y ago
What makes 100 years ago a good point of reference? as opposed to a date pre-industrial revolution maybe.
- ajsnigrutin 3y agoBecause we didn't measure (count?) the number of birds then, and we've been noticing a decline in the last few decades.