This is not how sexual selection works. In battles for access to reproduction, males compete with rival males. The environment that matters for performance is a social one—other males with whom a male does battle—rather than temperature or sea level or other physical features of the landscape. And this social environment evolves in tandem with the weapons. As antlers or horns become bigger, so, too, does the standard against which a male must contend. Like a sliding scale, each increase in weapon size resets the baseline of the population, selecting, in turn, for yet another increase.

Emlen, Douglas J, Animal Weapons_ The Evoluti…, loc. 182