Prior to the 1987 Montréal Protocol,there Existed Some Uncertainty in the Scientific

Multiple Choice

Prior to the 1987 Montréal Protocol,there existed some uncertainty in the scientific community as to the magnitude of ozone depletion caused by CFCs in the atmosphere.Nevertheless,the protocol did recommend phasing out CFCs from refrigerants and other uses because the potential consequences of not doing so were so severe.This is an example of applying the _______________ principle.

A) uncertainty
B) guilty-until-proven-innocent
C) precautionary
D) utopian
E) better-safe-than-sorry