Can you tell me what Is Pleonasm?

Can someone me with this english question

When mrs. jameson says "it (the desert) won't leave you cold," what does she mean?

Which best compares the authors’ purposes in silent spring and “save the redwoods”? both authors want readers to protect human rights. both authors want readers to focus on saving trees. both authors intend to entertain readers with their essays. both authors intend to convince readers of their viewpoint.