Environmental engineering is one of the most complex and fastest-growing di
sciplines in engineering. The scope of the field includes issues from publi
c health protection to aesthetics, and from the impact on business developm
ent to the development of legislation, standards, regulations, and guidelin
es, to their enforcement and environmental protection. The issues include c
ontaminants in gases, liquids, and solids and the phase transfers of the co
ntaminants. The sub-specialties of environmental engineering address all th
ese areas including the treatment of water, liquid waste, solid waste, and
gaseous materials, protection of the environment through proactive measures
, and the development of effective regulations. Environmental engineers hav
e the necessary skills to address these issues and improve the quality of l
ife of humans and other living things in an effective, sustainable, and eco
nomical manner. This paper outlines the evolvement of environmental enginee
ring and identifies many of the exciting new directions of environmental en
gineering profession.