Some of the disadvantages of oil are that it is a nonrenewable resource and creates air pollution. It also is often produced by countries who are unstable politically, and it can be harmful if spilled in the ocean or some other wildlife habitat.
Renewable resources are ones that regenerate themselves, such as wind or solar power. Oil is a nonrenewable resource because there is a limited supply in the world. When burned, the sulfur in oil turns into compounds that cause acid rain.
Oil spills are both costly and deadly. Cleaning up an oil spill uses resources, and many animals in the area can be harmed by the spill. Animals can ingest the oil, and birds' feathers can become coated in oil, causing them to lose buoyancy.