In Silent Spring, what is Carson referring to when she writes that there is a "human price" for the use of toxins?

She is referring to the poisonous effects that toxins have
on people. For example, pesticides get into drinking water and make people sick, even
killing some. Pesticides and agricultural chemicals get into our food supply. We eat
fruits and vegetables sprayed with DDT and it makes us sick. It causes cancer and all
sorts of other horrible conditions. Carson was trying to get humans to see that we are
an important part of the natural world and that we cannot keep poisoning the
environment. Humans should be better stewards of the natural world, seeking out better
and less harmful ways of controlling insects. When we use toxins, we are upsetting the
balance of nature. She believes it is arrogant and dangerous for humans to think they
should control nature instead of coexisting with nature.