Although fossil fuels are the nonrenewable resource that everyone is concerned with at the moment, there are other resources that we should be paying attention to as well.
Most of the elements on the periodic table cannot be created or destroyed, so we can reuse them over and over, as long as the cost of recovering and recycling them is acceptable. However Uranium is an exception to this. Uranium-235 is radioactive, meaning that over time it slowly changes into lead. While most authorities feel that the current reserves of U-235 will last us for a long time, the resource is nonetheless not renewable. As more countries look to nuclear power to replace vanishing fossil fuels, the rate of consumption of U-235 is likely to increase.