I am an atmospheric scientist, and feel it is the most interesting and rewarding career. As you know, climate change is a most important danger facing humankind, together with the degradation of the environment due to over-exploitation of Nature and natural resources. As an environmental engineer you will be able to guide people towards reducing these dangers that past generations, including mine, have created. You might want to look at a paper on Human and Nature Dynamics (HANDY):
There are many more aspects of human interactions with the environment that are dealt by environmental engineering, and they all have an impact on the future of society.
With best wishes,