Why are energy resources of earth limited?

The energy resources on Earth are limited because they are finite and take millions of years to replenish, such as fossil fuels like coal, oil, and natural gas. Renewable energy sources like sunlight, wind, and water are essentially unlimited, but harnessing them on a large scale still presents technical and economic challenges. Our increasing energy consumption is also depleting the available resources at a faster rate than they can naturally replenish.