On April 22, the 46th Earth Day will be celebrated around the world. Earth Day was created to start a movement throughout the world that would allow people to focus on the environment, according to earthday.org. Here are some things to know about Earth Day:

It began in 1970.

The first Earth Day was celebrated on April 22, 1970, and was founded by Senator Gaylord Nelson. During that first celebration, more than 20 million Americans rallied across the country for a healthy and more sustainable environment, according to earthday.org.

It is now celebrated across the world.

In 1990, Earth Day was recognized outside of the United States, with more than 200 million people celebrating this day all across the world. In 2012 in China, 100,000 people rode their bikes to help decrease CO2 emissions and save fuel, according to chinadaily.com.

Earth Day is on the same day as the signing of the Paris agreement this year.

This year, Earth Day will be on the same day as the Paris Agreement will be signed, according to un.org. The Paris Agreement is an agreement within the United Nations to take climate change more seriously and help reduce the dependency of fossil fuels, according to time.com.

Earth Day was changed to “International Mother Earth Day.”

In 2009, the UN officially declared April 22 to be International Mother Earth Day. Mother was added because it is a common expression used across the world “which reflects the interdependence that exists among human beings, other living species and the planet we all inhabit,” according to un.org.