What would happen to this landscape feature if the climate became more humid

Surface features will become more rounded, totally different from when the characteristic of the surface become more arid, in that case, the wind plays an important factor in the erosion and the change to a flatter form of the surface. For example: the great canyon.

The climate becomes more humid when the surface temperature warms up and brings a resulting increase in atmospheric humidity or vapor in the air. Water vapor is a greenhouse gas, the resulting increase in humidity causes global warming. Global warming has an high negative effect on landscape features.