5 Earth Day Quizzes to Test Your Environmental Knowledge (2026)

What is Earth Day? And why does it matter? 

Earth Day, observed every year on April 22, is the world's largest environmental movement. It was first held in 1970 and now brings together over a billion people across 193 countries. It exists to raise awareness of environmental challenges — from climate change and deforestation to plastic pollution and species extinction — and to inspire collective action. For businesses and individuals alike, it's a moment to reflect on impact and make meaningful commitments.

What better way to start than with a quiz on Earth Day and environmental literacy in general? Find out everything about this important day for our planet. It’ll for sure motivate you to take the other quizzes and have your friends do the same! 

Test your environmental knowledge

Deforestation & biodiversity

If we had to recommend one quiz, it would be this one — and yes, as foresters, we're a little biased. Deforestation is responsible for up to 15% of global CO₂ emissions, yet it remains one of the least-discussed drivers of climate change. This quiz covers why forests are irreplaceable, what we stand to lose when they disappear, and which ecosystems hold the greatest concentration of life on Earth. It's the one that tends to stick with people.

Go take that quiz

Oceans & plastic pollution

Plastic pollution is one of those issues that can feel abstract until you understand the scale of it. Over 8 million tonnes of plastic enter the world's oceans every year — and the consequences for marine ecosystems are severe. This quiz explores how plastic travels from land to sea, which species are most at risk, and what meaningful action actually looks like beyond swapping a straw.

Test me!

Clean energy

Find out everything about the different sources of renewable energy! Which countries are affected by climate change the most and which countries have already managed to completely run on renewable energy (and for how long)? What are the negative impacts of burning fossil fuels, and what’s the percentage of countries that could run entirely on renewable energy by 2050 (it’s giving us hope)?

Find the quiz here

Protect our species

The final quiz is perhaps the most sobering and the most motivating. Hundreds of species are lost every year, many before they've even been documented. But there's reason for hope too: this quiz covers not just the scale of the crisis, but the actions, individual and collective, that are genuinely making a difference.

I want to learn

What can you do to take action on Earth Day?

Awareness is the first step, but action is what changes things. Reducing single-use plastics, choosing renewable energy providers, eating less meat, and supporting reforestation projects all have measurable impact. At EcoTree, we make it easy to own trees in sustainably managed European forests, each one absorbs CO₂, supports biodiversity, and grows in value over time.

See the trees available to plant

5 things we learned today:

• Earth Day is on April 22, a global moment to reflect on how human behaviour affects the planet and commit to change.
• Deforestation drives up to 15% of global CO₂ emissions and destroys the habitats of millions of species, making forests one of our most urgent priorities.
• Over 8 million tonnes of plastic enter the world's oceans every year, threatening marine ecosystems from coral reefs to deep-sea species.
• Renewable energy could power 100% of the world by 2050; the technology exists, what's needed is the political and economic will to act.
• Species extinction is happening daily, but individual actions, from reducing plastic use to supporting reforestation, genuinely make a difference.