Question

Concerning the balance of pollutants in the biosphere:

scientists have proved that the natural system of the earth is overwhelmed by pollution
scientists have proved that the natural systems of the earth can absorb the current generation of pollutants
the long term balance of the biosphere under current conditions is uncertain

Answer 1

Im not sure about this one but I'd go with

A) scientists have proved that the natural system of the earth is overwhelmed by pollution

Answer 2

thanks!

Answer 3

yeah np