I agree- Rachel Carson. If you are going to attribute “policy” deaths to Mao, you should know that there are 3-5 million malaria deaths each year and the DDT ban has been in affect for enough decades to make Rachel Carson the responsible for more deaths than Mao.
But really, what is the value of millions of human lives when compared to the feeling of moral superiority that one experiences when advocating left-wing pseudoscience?