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Monday 22 April marks the 49th annual Earth Day!
Billions of people all over the world gather to celebrate the world and encourage more understanding about the environment and climate change.
We want to know how green you are on this Earth Day!
Take our quiz and find out whether you're an eco-warrior or just a worry for the environment...
Children in India participate in an Earth Day protest
What is Earth Day?
Earth Day is a yearly event held on 22 April.
It celebrates life on the planet, but also encourages people to be greener through protests, demonstrations and big clean ups in the communities.
People from all over the world come together to take part in Earth Day.
Check out our gallery of pictures from previous Earth Days.
1970: The first Earth Day ever! A woman wears a pin that reads 'Save your Earth, you can't get off."
1970: Earth Day protests in New York
1970: New York - girls form the 'Sweeper's Brigade' to help clean up the city
1990: Girls help clean up their community in Los Angeles as part of Earth Day
1993: An inflatable whale sits near the Eiffel Tower in Paris as part of Earth Day celebrations
2001: Kids encourage the world to use solar technology in this awesome group display in Los Angeles
2007: Protesters in Pakistan call for more awareness of recycling in waste on Earth Day
2008: Protesters in London demanding more renewable, green energy over coal
2014: Students in India paint their faces green and white with environmental slogans
2019: A woman puts on tiger face paint before a protest