In 1962, rachel carson published silent spring, which dramatized the potential dangers of to food, wildlife, and humans and eventually led to changes in the united states on their use.

pesticides

Explanation:

One major theme of the Silent Spring is the negative power of humans to affect natural world by polluting and making it lethal with the use of pesticides. Carson argues that pesticides have harmful effects on food, on wildlife and on humans. The author gives the example of DDT which is a prime killer and goes on to blame the chemical industry of deliberately  spreading wrong information.

The book explores the effects of pesticides on natural ecosystems, on foods that humans consume which lead to cancer and other serious diseases. Critics said that Silent Spring changed the balance of power in the world since many policy changes came into force in the use of DDT and other pesticides and environment-policy changes. Silent Spring helped cause a reversal in the US' national pesticide policy, which led to a nationwide ban on DDT for agricultural uses. It helped create the US Environmental Protection Agency in 1970.

the manager emerges. taking marlow aside, he says they have done all they can for kurtz. he adds that kurtz did more harm than good for the company. his actions were too "vigorous" for the moment. the manager says that kurtz was unethically gathering ivory by exploiting the locals. this, of course, is rather ironic coming from a guy who makes his living by exploiting the locals in the worst ways.

explanation: