I saw a report recently, about how gravity, which is a non-renewable resource, is gradually diminishing.
Top scientists agree, "With the present rate of consumption, the earth's supply of gravity will be exhausted before the 22nd century," say several prominent physicists. "There is a direct link between the vanishing of the ozone layer and the decrease in the earth's gravity supply. We're already seeing the effects of the disappearance of the ozone layer, but we're not likely to feel the effects of vanishing gravity during our lifetimes. However, our children will probably have to deal with the issue."