>>There is a test tube with a microbe on the bottom.
>>It looks around and decides to breed. Soon there
>>are two microbes. A few days later there are four
>>microbes. A small microbe society begins to form.
>>After a day or two the test tube is ten percent
>>full and it's microbe heaven. Then twenty and then
>>forty and fifty percent. Life for the microbes is
>>good. With the tube fifty percent full they look
>>around and see lots of room for expansion. Unfortunately,
>>they haven't paid too much attention to the fact that
>>their species has expanded at almost an exponential
>>pace and they are at fifty percent. The next time they
>>breed they'll be swimming in their own poop as they die.
>>Well, folks the test tube is the earth and we are the
>>microbes and we are at about fifty percent planet occupation.
>>What will we do?
>
>How long is a microbe day in earth days? A hundred-thousand to one maybe? I think we're ok of awhile.
Nope
http://www.livescience.com/strangenews/060224_world_population.html