Easy: it would make the desert a little bit less inhospitable, and it would make the average person a little bit less in shame of the environmental havoc they c

Easy: it would make the desert a little bit less inhospitable, and it would make the average person a little bit less in shame of the environmental havoc they cause. Both things would beget more humans on the planet, which would be bad for the (the part of the) environment (not directly connected to humans).