But lower oil prices, coupled with expectations of a decline in demand, would in turn put pressure on oil-producing countries to reduce planned investments in production capacity or even to mothball major projects, as they have done in the past, leading to a decline in oil supplies. Thus, if alternative energy technologies did not come on-line by the time oil production started to fall, global shortages would become inevitable, while closing the investment deficit would take years, even in the face of rising oil prices.