What is an example of a non-renewable natural resource?

Natural gas is indeed an example of a non-renewable natural resource. This is because it forms over millions of years from the remains of ancient marine organisms, and once extracted and used, it cannot be replenished within a human timescale. The consumption of natural gas contributes to energy production, yet it depletes the finite reserves that exist in the earth.

In contrast, solar energy and wind are renewable resources, as they can be harnessed constantly and do not diminish over time. Forests, while renewable to some extent through sustainable management practices, also can be considered non-renewable if they are over-exploited and not allowed to regenerate properly.