What will be the impact of continued water pollution and overuse on humans, and natural ecosystems?

Sea levels rise due to the melting of the glaciers, caused by Global Warming; More flooding due to the erosion of soil and lack of trees; Water shortage -  we only have a limited supply of fresh drinking water; Disruption of the food chain when the apex predators become extinct; Biodiversity is lost, as whole species of living things disappear due to deforestation; There will be a food shortage as the lands become barren and the oceans become empty of fishes; Pollution will eventually become unmanageable and affect our health; Rising temperatures may be too much for all living things on the planet. 

The answer which is not a detail carson used to describe the pool in the cave at low tide is b.  hundreds of periwinkles browse the branches and roots of the trees.