Oil shortages. Conceptual artwork of a fuel can in a bell jar surrounded by water. This image represents the shortage of oil that will result as consumption increases, existing reserves are used up, and it become more and more difficult to find new sources. Just as the air in the bell jar is limited, existing oil reserves are finite and will eventually run out. This image can also represent the damage oil extraction, and the burning of oil, does to the environment, indirectly contributing to climate change and flooding.