To solve this problem, we need to identify the subject of Rachel Carson's famous book 'Silent Spring'.$\newline$Let's analyze the options:$\newline \bullet$Option 1: Pesticide pollution$\newline$ - 'Silent Spring' is widely recognized for its focus on the environmental impact of pesticides, particularly DDT.$\newline$ - The book raised awareness about the dangers of pesticide use and its effects on wildlife and human health.$\newline$ - Therefore, this option is directly related to the book's theme.$\newline \bullet$Option 2: Noise pollution$\newline$ - Noise pollution is not the focus of 'Silent Spring'.$\newline$ - The book primarily addresses chemical pollution, not auditory pollution.$\newline \bullet$Option 3: Population explosion$\newline$ - While population growth can impact the environment, 'Silent Spring' does not specifically address this issue.$\newline$ - The book is more concerned with chemical pollutants.$\newline \bullet$Option 4: Ecosystem management$\newline$ - Although 'Silent Spring' discusses the impact of pesticides on ecosystems, it is not primarily about ecosystem management.$\newline$ - The book's main focus is on the harmful effects of pesticides.$\newline$Based on this analysis, the correct option is:$\newline$Option 1: Pesticide pollution$\newline$This corresponds to the correct option, which is Option 1.