The Lower Columbia River Estuary Partnership recently held a three-day conference on the river’s health. New data collected by the U.S. Geological Survey and National Oceanic and Atmospheric Administration show concentrations of pesticides, industrial compounds, and flame retardants in the river. A proposal has been made to impose stringent restrictions on methods and practices of disposal of waste in residences, businesses, and farms. In order to prevent draconian restrictions, it is crucial to show that __________.
A. the proposed controls must be implemented without delay
B. a causal link exists between purportedly harmful substances and environmental damage
C. the most obvious offenders of the existing controls must be the most severely punished
D. evidence must be presented to unequivocally pinpoint the source of pollutants
E. any existing damage to the Lower Columbia River is reversible