And to show you what the situation is er the world's energy demand is very likely i i i is almost certain to increase er because of development in the world and also because of the growing population  er that arrow is some sort of guess as to how the world er the demand for energy worldwide is likely to increase  when you set that against the curves at the bottom which show the likely projections for oil and natural gas  as you can see as we get into the next century those er fossil fuels, which we've been using with gay abandon for many decades, will start to into er decline.