Explain the ways humans depend on the natural environment and how human activities negatively impact it.

a) Humans depend on the natural environment for their survival in several ways:

1. Air: The environment provides the oxygen necessary for respiration, which is vital for human life.
2. Water: Humans depend on natural water sources like rivers, lakes, and groundwater for drinking, sanitation, agriculture, and industrial uses.
3. Food: The natural environment, including fertile soil and diverse ecosystems, supports the growth of plants and animals that serve as primary food sources.
4. Raw Materials: Natural resources such as timber, minerals, and fossil fuels are extracted from the environment to provide materials for shelter, tools, clothing, and energy.

b) Human activities can have several negative effects on the natural environment:

1. Deforestation: Clearing forests for agriculture, logging, and urbanization leads to habitat loss, soil erosion, and contributes to climate change by reducing carbon dioxide absorption.
2. Pollution: Industrial emissions, vehicle exhaust, and improper waste disposal contaminate air, water, and soil, harming ecosystems and human health.
3. Climate Change: The burning of fossil fuels releases greenhouse gases, leading to global warming, rising sea levels, and more frequent extreme weather events.
4. Loss of Biodiversity: Habitat destruction, pollution, and overexploitation of resources cause the extinction of species and reduce the overall variety of life on Earth, weakening ecosystems.