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

Concerning the balance of pollutants in the biosphere, Scientists have proved that the natural system of the earth is overwhelmed by pollution.