When do respected scientists believe that our planet will be
uninhabitable?  I'm wondering if we will be unable to live here in
1.000 years... 10,000 years... 100,000 years?  What will be some of
the most likely reasons we won't be able to survive anymore?  Or will
we always be able to survive?  Do they believe that some catastrophe
(ice age, meteor crashing into earth, etc.) will occur before we run
out of resources?  I'm not looking for crazy scientists or sci-fi
answers here (if possible! they might be the only ones that think
about this!).  I don't know how much this has been researched, or if
it is possible to look this far into the future in a serious
scientific way.  But I'd like the most opinions possible, whether they
are similar or opposing. Thanks all!

Most of what would/could make this world uninhabitable is a matter of
speculation, some of it more likely than others. For instance, it is
possible that the green house gases that we as a civilization are
emiting into the atmosphere if not stopped in time may lead to a
runaway greenhouse effect on earth much like what we see on Venus with
temperatures hot enough to melt metal, however, that may never happen.
We may stop polluting before the world reaches that point, we may even
reverse the effect of green house gases (dumped by us) in the
atmosphere to what was 'normal' two centuries ago by creating huge
racks (6 square miles each) in the ocean were we would raise seaweed
(one of the fastest growing plants in the world), we could then
harvest that material and burn it without producing CO2 and use the
energy to power the planet, that would/could nulify the damage done up
to now. Huge meteors could hit the earth as they do about once every
100 million years or so, but then again they may not, or by then we
may know how to prevent that from happening. So the possible scenarios
that could lead to making this planet uninhabitable are mind numbing
and the possible outcome of each would vary depending on our level of
technology at the time. I would imagine that the best way to put it
would be; It is anybody's guess really.

Now, the only scenario that we know is inevitable and will eventually
make this world uninhabitable is when the sun goes nova. When that
happens the radiation and solar wind will destroy the planet's
atmosphere making earth uninhabitable, way before the sun ever reaches
earth. Eventually the sun will engulf the planet and pretty much melt
everything on the surface of it. The expansion will cease and a
contraction of the star will ensue leaving a scorched uninhabitable
planet behind, the sun will likely become a brown dwarf. Luckily that
will not happen for another 4 billion years or so.

I'll go out on a limb and speculate that the planet will still be
inhabitable in 1.000 Years.

Another thing to consider are Extinction-Level Events (ELE).

"A 1998 survey by the American Museum of Natural History found that
70% of biologists view the present era as part of a mass extinction
event. Some, such E. O. Wilson of Harvard University, predict that
man's destruction of the biosphere could cause the extinction of
one-half of all species in the next 100 years (see Red Queen effect)."
http://en.wikipedia.org/wiki/Extinction_event

Very interesting, thanks for your ideas.  I couldn't find ANYthing on
this topic so you've helped me out a lot.  Anyone else with any
information keep it comming!

I hope you do not get uptight about a scriptural answer. On the basis
that the world was created for man to live on, by God, and that he
supplied the Bible for information for our benefit. Psalm 37;29 states
" The righteous themselves will possess the earth, and they will
reside FOREVER upon it". Ecclesiastes 1;4 " A generation is going and
a generation is coming, but the earth is standing even to time
indefinite". Psalm 104;5 "He [God] has founded the earth upon its
established places, It will not be made to totter to time indefinite,
or forever". These scriptures preclude the earth being destroyed by
Atomics, comets, or just about anything we can think of. Other stars
and their systems may be finishing their lifespans in cataclysmic
explosions, but THIS ONE is special. But it takes faith to believe it.

"I'll go out on a limb and speculate that the planet will still be
inhabitable in 1.000 Years."

The more interesting question is whether it will be *inhabited* in 1000 years.