White Corps doesn't have anything as destructive which would deal a fatal blow to a planet's ecosystem in one shot. Or well, not unless designed that way. The means exist, the will and sufficient market for such weapons, does not.
What they focus is on efficiency. Ever hit by thousand tons of superdense metal at superluminal velocity? Then how about this projectile unraveling into a nearly endless strand of micron-thick strings during impact, slicing up the target into tiny pieces during the process?
The effects are as devastating as you think. :lol