Despite what the environmentalists say; most scientists are coming to the conclusion that increased activity on the sun is responsible for global warming, so there is really nothing man has done or can do to stop it.
Most scientist also concede that the "hole in the ozone layer" has been there all along.
Environmentalists get grants and funding by keeping the "man made crisis" global warming myth alive.
When I was a kid the crisis that was funding environmentalists was global cooling in the late 60's and early 70's, and acid rain in the late 70's and through out the 80's.
The grants and funds dried up on those and they have become extinct, as will happen to "Global Warming" too.
Just follow the money; it will lead you to some really odd places sometimes.
Who says gravity has never been proved?
Gravity is the result of the atomic weight of air. at sea level air has enough weight to exert 14.7 PSIA on the planet.
Anything more dense than air will be pulled toward the earth and anything less dense than air (a Helium filled balloon for example) will rise away from the earth.
And what is that balderdash about objects with mass being attracted to each other?
If there were any truth to that cars left in a parking lot long enough would end up in a big pile, whenever a baseball lost momentum it would not just randomly fall but would always be attracted to what ever object has the most mass, all planets would be magnets for asteroids, and the planets would collide... Even the helium balloon has mass. If all objects with mass are naturally attracted to each other; why doesn't a helium filled balloon naturally fall to earth as soon as you let it go?
BENJAMIN: Rather than hanging out on yahoo answers your time might be better spent in a classroom.