Question

how long are various non biodegradable substance expect to last in our environment?

Answer 1

The exact time for degradation is still unknown but the subtances like glasses takes hundreds of years whereas plastics are expected to be decomposed uptill 1000 years.

Answer 2

Non biodegradable substances are those that cannot be broken down by biological processes..
It takes many years for decomposition.
For ex:- Plastics which are said to be non- biodegradable takes more than 50,000 years to decompose... It is harmful for our environment..