Changes in the Environment

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Introduction to Changes in the Environment

The environment changes over time. Volcanoes erupt. Floods sweep away soil. Human actions harm air and water. People clear forests and burn coal. These moves raise heat and pollute streams.

Owners cut trees to plant crops or build roads. Bare land erodes under rain and wind. Dust drifts into villages. Factories send smoke and chemicals into air. Cars pump exhaust into streets. Breathing problems rise and crops wilt.

Greenhouse gases trap heat from sun. Burning coal and oil drives carbon into sky. Ice caps melt and sea levels climb. Dry regions face long droughts. Floods hit low lands. People bike or walk instead of driving. They cut power use and waste less. Laws protect forests and shift energy to wind or sun.