Problem 2
Important environmental benefits have been gained by banning the use of leaded gasoline in Canada. Why were there long delays in taking similarly vigorous actions against the use of lead shot in hunting and skeet shooting and lead weights in fishing?
Problem 4
Explain the principles of bioaccumulation and biomagnification using the case of methylmercury in aquatic ecosystems. Why do you think these phenomena were unanticipated "surprises" to environmental scientists?
