🔬 ScienceGrade 2Lesson 15
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Human Impact on Environment

Lesson preview: the Mini Lesson and Vocabulary are open to everyone. Guided practice, exercises, the parent checklist and the printable PDF worksheet come with full access (free 7-day trial or membership).

Learning Objectives

  • 1Identify actions that harm and actions that help the environment and explain what Reduce
  • 2Reuse, and Recycle each mean
  • 3Name one personal action that helps the environment
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Mini Lesson

Everything people do — driving a car, throwing away trash, turning on a light — affects the natural world around us. That effect is called our human impact on the environment. It can be harmful or helpful. The good news is that we can choose to help!

How humans harm the environment

  • Pollution — releasing harmful substances into the air, water, or land. Car exhaust, factory smoke, and litter are all forms of pollution.
  • Deforestation — cutting down large areas of forest to make farmland or build roads, destroying habitats for animals and plants.
  • Burning fossil fuels — burning coal, oil, and gas to make energy releases gases that trap heat in the atmosphere, warming the planet.
  • Wasting water — leaving taps running or watering gardens during rain uses more fresh water than the planet can easily replace.

How humans help the environment

  • Reduce — use less in the first place (shorter showers, fewer single-use items).
  • Reuse — use something again instead of throwing it away (refillable water bottle, cloth bag).
  • Recycle — sort waste so materials like paper, glass, and plastic can be made into new things.
  • Planting trees — trees absorb carbon dioxide, provide oxygen, and restore animal habitats.
  • Saving energy — turning off lights and unplugging devices uses less electricity.
  • Picking up litter — stopping trash from reaching rivers and oceans protects wildlife.
Human impact on the environmentTwo side-by-side panels. The left panel shows a healthy green forest with clean air and animals. The right panel shows a polluted landscape with smoke, cut-down trees, and litter.Helps the EnvironmentRClean air & waterHarms the EnvironmentPollution & deforestation
A healthy environment (left) compared to a polluted, deforested one (right).
The three Rs: Reduce, Reuse, RecycleA triangle diagram with Reduce at the top, Reuse at the bottom left, and Recycle at the bottom right. Each corner has an icon and a short description. Arrows connect the three in a cycle.The Three RsReduceUse less to start withRecycleSort waste to make newReuseUse it again instead
The three Rs — Reduce, Reuse, Recycle — connected in a continuous loop.
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Ask yourself: Can I give one example of an action that harms the environment and one that helps it? What do the three Rs stand for?

Vocabulary
Human impact
The effect that people’s actions have on the natural world — can be harmful or helpfule.g. pollution hurts; recycling helps
Pollution
Harmful substances released into the air, water, or lande.g. factory smoke, litter, car exhaust
Deforestation
Cutting down large areas of forest, destroying habitatse.g. clearing trees to build roads
Fossil fuels
Coal, oil, and gas — burning them releases heat-trapping gasese.g. gasoline and coal
Reduce
Use less of something in the first place so less waste is madee.g. take a shorter shower
Reuse
Use an item again instead of throwing it awaye.g. a refillable water bottle
Recycle
Sort used materials so they can be made into new productse.g. put glass jars in the bin
Conservation
Protecting and caring for the natural environmente.g. planting trees, saving water
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