Human Impact on Earth
Aligned to MS-ESS3 — Next Generation Science Standards.
What this lesson teaches
Human activities — burning fuels, farming, building — affect Earth's systems and resources. Understanding cause and effect helps us reduce harm and use resources sustainably.
Worked examples
Example 1
Burning fossil fuels releases carbon dioxide, which traps heat and warms the climate; switching to solar and wind reduces that effect.
Example 2
Deforestation removes trees that absorbed carbon dioxide and also exposes soil, so the same act raises emissions and increases erosion.
Example 3
Every energy source has a cost. Solar panels need mined materials, and hydropower floods valleys — the question is which trade-offs a place can accept.
Practice questions
- Give one human activity and its effect on an Earth system.
- How can communities reduce their impact?
- Why are some resources called nonrenewable?
Watch the lesson
Every lesson comes with a video taught in English and Spanish — the same video the QR code in the printed workbook opens.
▶ Watch this lessonEn español
Impacto Humano en la Tierra
Las actividades humanas — quemar combustibles, la agricultura, la construcción — afectan los sistemas y recursos de la Tierra. Entender la causa y el efecto nos ayuda a reducir el daño y a usar los recursos de manera sustentable.
Ejemplo 1: Quemar combustibles fósiles libera dióxido de carbono, que atrapa el calor y calienta el clima; cambiar a energía solar y eólica reduce ese efecto.
Ejemplo 2: La deforestación quita árboles que absorbían dióxido de carbono y además expone el suelo, así que el mismo acto eleva las emisiones y aumenta la erosión.
Ejemplo 3: Toda fuente de energía tiene un costo. Los paneles solares necesitan materiales extraídos, y las hidroeléctricas inundan valles — la pregunta es qué compensaciones puede aceptar un lugar.
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