🔬 ScienceGrade 3Lesson 5
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How Humans Affect Nature

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 positive and negative human impacts on the natural environment
  • 2Explain how everyday choices affect nature
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Mini Lesson

Humans are part of nature, but our actions can either help or harm the natural world. Some of our choices protect ecosystems and wildlife, while others damage the environment through pollution, deforestation, and waste.

Positive Human Impacts

  • Planting trees helps restore forests and reduces carbon dioxide in the air.
  • Recycling waste reduces the amount of trash sent to landfill.
  • Creating nature reserves gives wildlife a safe space to live and breed.
  • Using solar and wind energy reduces pollution from burning fossil fuels.
  • Cleaning up beaches and rivers protects marine and freshwater habitats.

Negative Human Impacts

  • Cutting down forests destroys habitats and releases stored carbon.
  • Dumping waste in rivers poisons fish and other aquatic life.
  • Burning fossil fuels releases gases that cause climate change.
  • Oil spills at sea coat marine animals and kill ecosystems.
  • Overfishing reduces fish populations and upsets food chains.
Positive vs Negative Human ImpactA split diagram. Left half shows a healthy green forest labeled Positive. Right half shows gray factory shapes with smoke labeled Negative.Human Impact on NaturePositiveNegative
The 3 Rs — Reduce, Reuse, RecycleThree circles arranged in a triangle. Each circle shows one of the 3 Rs: Reduce at the top, Reuse at bottom-left, Recycle at bottom-right.The 3 Rs of ConservationReduceReuseRecycle
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Every choice matters — even small actions like recycling or picking up litter can make a positive difference to nature.

Vocabulary
Pollution
Harmful waste that dirties the air, water, or lande.g. Smoke from cars adds to air pollution.
Recycling
Turning used items into new things instead of throwing them awaye.g. Recycling paper saves trees.
Deforestation
Cutting down large areas of foreste.g. Deforestation destroys animal habitats.
Conservation
Protecting nature and using its resources wiselye.g. Nature reserves help with conservation.
Ecosystem
A community of living things and the place where they livee.g. A pond is a small ecosystem.
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← Lesson 4: Adaptations in AnimalsLesson 6: Protecting Endangered Species →