United mod for Half-Life 2

United takes place in the near future. Circa 2030 would give a good idea. Nearly the entire planet is highly industrialized, and high rise buildings are the rule, not the exception. Imperialist powers seek to gain control over the world at large, while rebel groups engage them in guerilla combat. The game will be centered around combat in urban areas, which themselves hold an eerie, if vague familiarity to modern times.