Earth Day Quiz
2025

How well do you know our planet? Test your knowledge ofclimate change, ecosystems, environmental history, recycling, and the science of Earth — 20 questions, zero fluff.

🌡️ Climate🌿 Nature♻️ Recycling⚡ Energy🌊 Oceans📅 History

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🌍 Earth Day — Key Facts & Figures

Earth Dayis observed every year onApril 22. It was first celebrated in 1970, when Senator Gaylord Nelson of Wisconsin proposed a national day focused on the environment after witnessing the devastation of a 1969 oil spill in Santa Barbara, California. Today, Earth Day is recognized in more than 190 countries and is considered the largest secular civic event in the world.

1970First Earth Day — 20 million Americans participated

190+Countries that observe Earth Day annually

1B+People participate in Earth Day events each year

1.5°CParis Agreement global warming limit target

8MTons of plastic that enter oceans every year

150+Species lost to extinction every single day

Why Earth Day Matters

Earth Day gave rise to the US Clean Air Act (1970), the Clean Water Act (1972), and the Endangered Species Act (1973). The 1990 Earth Day mobilized 200 million people in 141 countries and led to the 1992 United Nations Earth Summit. Every year, the date renews global attention to deforestation, ocean plastic, greenhouse gas emissions, biodiversity loss, and renewable energy transitions.

Earth Day Quiz — FAQ

When is Earth Day celebrated?

Earth Day is April 22every year. In 2025, Earth Day falls on a Tuesday. The date was chosen in 1970 by Senator Gaylord Nelson and organizer Denis Hayes to maximize student participation — it falls between spring break and final exams at most US colleges, and it's generally warm enough in the Northern Hemisphere for outdoor events.

What was the first Earth Day?

The first Earth Day was onApril 22, 1970. It was inspired by a massive oil spill off Santa Barbara, California in 1969 that killed thousands of seabirds, dolphins, and marine life. Approximately 20 million Americans took to the streets, parks, and campuses. Within a year, the US government created the Environmental Protection Agency (EPA).

What are the biggest environmental issues tested in this quiz?

This Earth Day quiz covers six key themes:climate change(greenhouse gases, temperature rise, Paris Agreement),nature & biodiversity(deforestation, species extinction, rainforests),recycling & waste(plastic pollution, composting, recyclable materials),clean energy(solar, wind, fossil fuels),oceans(acidification, plastic, coral reefs), andEarth Day history(founding, milestones, legislation).

What percentage of CO₂ comes from human activity?

According to the IPCC,virtually all (97%+) of the increase in atmospheric CO₂ since industrialization is due to human activity, primarily the burning of fossil fuels, deforestation, and cement production. The concentration of CO₂ in Earth's atmosphere has risen from ~280 ppm before the Industrial Revolution to over 420 ppm today — a level not seen in at least 3 million years.

How much of Earth's surface is covered by ocean?

Approximately71% of Earth's surface is covered by ocean. The oceans contain 97% of all water on Earth and produce more than half of the oxygen in the atmosphere — more than all the world's forests combined. Despite this, over 80% of the ocean remains unexplored. Ocean acidification (caused by CO₂ absorption) threatens coral reefs, shellfish, and marine ecosystems globally.

What is the Amazon rainforest's role in the climate?

The Amazon rainforest — often called the "lungs of the Earth" — absorbs approximately 2 billion tons of CO₂ per year and produces 20% of the world's oxygen. It is home to about 10% of all species on Earth. However, large parts of the Amazon have crossed into a "dieback" zone due to deforestation, releasing more CO₂ than they absorb in some areas — a critical climate tipping point.