The first Earth Day is celebrated.

Earth Day is an annual event celebrated on April 22nd, with the aim of raising awareness and promoting action to protect the environment and promote sustainability. The first Earth Day was celebrated in 1970, and since then, it has become a global event, observed by over 192 countries. Earth Day serves as a reminder that we all have a responsibility to protect the planet and its natural resources, and it encourages individuals, communities, and organizations to take action towards preserving the environment.