I would say that Rachel Carson was mainly criticizing the use of pesticides as killers of wildlife both plants and animals that resulted in a "Silent Spring" without birds and insects like bees to pollinate killed by the insecticides and she sounded the alarm and called for the widespread curtailment of these harmful chemicals whereas John Muir I believed extolled the virtues of the giant redwoods and called for their preservation so he was a conservationist.
