Hey ho, how ya doing?  I'm an environmental engineer!  I protect humanity from the adverse effects of the outside environment.
Oh wow what does you job entail?
I design structures that are able to shield people from things like rain and hail.  I also an concerned with energy preservation and protection of natural resources.
Oh dang that sounds quite important. thats cool.
I also cross with public health workers and collborate with them on issues like waterborne diseases.