If humans can create a Big Bang (and a new universe) - will we be God? Maybe not. But it can put all you "heat death fatalists" in your place!
http://web.mit.edu/physics/facultyandstaff/faculty/alan_guth.html
Working with Prof. Edward Farhi and others, Guth has explored the question of whether it is in principle possible to ignite inflation in a hypothetical laboratory, thereby creating a new universe. The answer is a definite maybe. They showed that it cannot be done classically, but with quantum tunneling it might be theoretically possible. The new universe, if it can be created, would not endanger our own universe. Instead it would slip through a wormhole and rapidly disconnect completely.
http://web.mit.edu/physics/facultyandstaff/faculty/alan_guth.html