The 4 Pressures now on Earth's populations

The 4 Pressures now on Earth's populations. Though there are many more pressures than this on earths billions, these are the most serious ones that I now see.

1.Overpopulation
2.The end of oil
3.Global Climate Change
4.Iraq and Afghanistan

Which in turn have created:
The lowest food stores worldwide in 30 years
which has created:
Food pricing for starvation
which is creating
food and water wars worldwide

Because of all these factors it is very likely that up to 1/5 of the present level of population of earth will die from starvation, lack of good potable water or exposure during the next 20 years on earth.

In the past 100 years world population was relatively manageable and relatively stable. However, with overpopulation and the end of oil(that is easily attainable at low prices), Global Climate Change and Iraq and Afghanistan bankrupting not only the United States but the free world it is now inevitable that up to 1/5 of the humans on earth will die of starvation, lack of potable water and exposure to the elements over then next 20 years on earth. The real sadness is that there is little at this point that anyone or any group can actually do about it! I'm writing this in the hope that one or more of you might have some useful workable ideas to help solve this problem! For without some practical solution all of us will have to watch while up to 1 billion people die during the next 20 years! And unfortunately at the end of 20 years it could then get worse. Being aware of this problem might help to actually create a workable solution over the next 20 to 50 years!