Silent Spring is considered the book that started the global grassroots environmental movement. Released in 1962, it focuses on the negative effects of chemical pesticides that were, at the time, a large part of US agriculture.

Correct options are A, D, F and G.

The words and phrases from the excerpt that best support the author's purpose of creating a sense of alarm about the environment include, these disasters , grim specter , tragedy and stark reality.

These words are the ones that best support the author's purpose of creating a sense of alarm about the environment. The author wants us to be aware of the critical situation we are at in terms of the natural world. He tells us that natural disasters have already occurred in many places in the world, and that these grim prospects might one day become our everyday reality.