You really need to be more explicit about what you mean by "our world."
If you mean will the planet still exist, then yes, of course it will, with 99.999999% certainty. Whatever damage we may have done to the Earth by that time will not make it disappear, nor extinguish all life on the planet. The Earth has been through much worse in the past than anything we could do.
If you mean in a more figurative sense, will the world of 2000 still exist in 2500, then no, of course it won't, just as the world of 1500 no longer exists today.