Yes, ever since the early 20th Century 'light pollution' has become a problem without people even being aware of it.
There are twenty fiftys in a thousand.
Astronomical light pollution started as street and road lighting became widespread from the early 20th century. It was bad enough by the 1980's for the dark sky movement to gather momentum. Local light pollution, for instance from obtrusive security lights, is a more recent problem, perhaps from about the 1970's.
Thirty-one fiftys (!) is 31*50 = 1550, whether as an integer or a decimal.
0.42
Pollution is a problem for everyone living on Earth!
yes, pollution is a huge problem in countries like china and India and overall, pollution is a huge problem for the earth and its inhabitants.
It is a problem to everyone.
34
he is constantly in the early fiftys
Eleven fifties is 550.
4/350 = 1.1429%
Air pollution is not useful. It is a problem.