LET HAVE A LITTLE BIT FUN!!!!!!!

which among the environmental profession is the most relevant one,which without is presence the environment is meaningful. such as

SOIL SCIENCE
GEOLOGY
WATER SCIENTIST 
ENVIRONMENTAL HEALTH 
MEDICAL DOCTOR
TOXICOLOGY
ENVIRONMENTAL ECONOMIC
ENVIRONMENTAL RESOURCES
PHARMACY  
AND MANY MORE
 pls when comment ;- indicate your profession ,and tell us why you fell so.... the FUN begin !!!!! ,