On human scale fossile energies are hardly renewable because it took millions of years for them to form, while we consume them whithin a few decades, or centuries at most. In contrast, solar, wind, hydro, and geothermal energy make use of very large reservoirs. Granted, one day the sun will stop shining, the earth will not revolve any more and its core becomes cold, but by then the human race will have altogether different problems...
For the time beeing we should try to make use of these renewable or
sustainable forms of energy rather than consume fossile reservoirs without
taking care of following generations.