International agreements?

Question

i am doing a course and need to know "Why international agreements are necessary to protect environmental health and community health?"

Answer 1

env health / community health as taken a new dimension with global travel.  it can spread across borders easily.  hence the need for international agreements to obligate every  country to help in the fight eg - if tracing of the sars virus from HK, Singapore, Taiwan, canada would not be possible without international agreement.   aids is another example.  we need to fight it internationally as its spread is beyond the control of individual countries