Question

The most widely used renewable energy source is _____.

Answer 1

The most widely used renewable energy source is hydropower.  While this has many benefits, it also causes many environmental concerns when the dams get built.

Answer 2

Answer: Hydropower (Hydroelectric power)

Explanation:

This is the most widely used renewable energy source due to its abundance, meaning each region with sufficient water flow could generate its own power. It is a clean source of energy and as such there's little concern for pollution. These among many other reasons has made Hydropower to account for about 54% of the world's installed renewable energy source and accounting for over 16% of the total energy produced in the world. It remains the world's primary, and most valuable, source of renewable energy.