"Human beings Influence on nature." . . . . "Pollution Canada." . . "Environmental policy Canada." . . . . "It is not too late, yet : a look at some pollution problems in Canada's natural environment, an identification of some major concerns" . "It is not too late, yet : a look at some pollution problems in Canada's natural environment, an identification of some major concerns"@en . . . . . . . . . "It is not too late - yet"@en . . "It is not too late - yet" . . . . "A look at some pollution problems in Canada's natural environment; an identification of some major concerns."@en . . "It Is Not Too Late - Yet. a Look At Some Pollution Problems in Canada's Natural Environment, an Identification of Some Major Concerns" . "It is not too late - yet : a look at some pollution problems in Canada's natural environment, an identification of some major concerns" . . "It Is Not Too Late - Yet" . . . . . "Environnement Politique gouvernementale Canada." . . "Environmental Pollution Canada." . .