What will most likely bring the human population down to a sustainable number ?

Answer 1

space travel?
colonize other planets that are capable of sustaining our type of life

Answer 2

This is a hard question. Well people will always say disease or war will bring the population down but did anyone think that because of technology and modern medicines prevent natural selection from working? If we took out medicine and try not to save people then the ones that are in good health will be alive. Because of cures disease will always try to better itself for survival and we will always try and find cures.

Answer 3

In the past, it's usually been plague of some sort. It could be that again. It could just be that we'll rag out the earth to the point that not enough food can be grown to sustain much life. It may be nuclear war.

Answer 4

Widespread natural disasters brought on by global warming. Fires, floods, hurricanes, droughts, famines. In this warm, moist environment, disease causing organisms will proliferate and cause worldwide pandemics. And of course there will be wars over more oil to make the problem even worse. Check out sierraclub.org. They are not an environmental extremist group. They know what they are talking about.

Answer 5

the population is sustainable now in the world.there are pockets where life is less than sustainable and some even starving but i suspect that will always be the case.

Answer 6

Another 4 years of Republicanism

Answer 7

The above is more likely, but its also possible that our future space exploration might actually bear real fruit in allowing us to live elsewhere too.

Fact is, we have only just started on all the possibilities out there. Only time will tell how we end up.

Answer 8

Plague or war, always a good way to hold down the population

Answer 9

A microbiological mutation has the best chance to severely reduce the human race in a short period of time.

Answer 10

Starvation or Nuclear War

Answer 11

Looks like a Nuclear War....