Mammals are adapted to live in the following environments:
a. land
b. air
c. water
d. all of the above

relative humidity, temperature and dew point -- are bound together in the mathematical relationship below. relative humidity changes when temperatures change. because warm air can hold more water vapor than cool air, relative humidity falls when the temperature rises if no moisture is added to the air. so i would say a

1. efficient use of space

2. elimination of groundwater contamination

3. energy generation

4. lower carbon footprint