In a relationship with two variables when both change in the same direction, whether increasing or decreasing by the same factor, the variables are said to be

for  example, forests have higher evapotranspiration than other ecosystems,  such  as grasslands, because of their deeper roots and greater leaf area. thus forests have a net moistening effect on the atmosphere and become a moisture source for downwind ecosystems.

the man is bald so he has no hair to get wet