Answer:
its b 1970
Explaination: Earth Day is an annual celebration held on April 22nd to increase environmental awareness and inspire people to take action to safeguard the earth. Earth Day was first observed in 1970, making 2022 the 52nd anniversary. Wisconsin Senator Gaylord Nelson suggested the idea of Earth Day in order to create a national day to focus on environmental issues and draw attention to the hazards of pollution and other environmental crises. The inaugural Earth Day was a big success, with an estimated 20 million Americans taking part in demonstrations, marches, and other environmental-related events. Since then, Earth Day has grown into a worldwide celebration, with millions of people taking action to safeguard the environment.