22 April is observed every year internationally as:

Earth Day is celebrated globally on 22 April each year to promote environmental protection and raise awareness about issues such as climate change, pollution, deforestation, biodiversity loss, and sustainable living. The first Earth Day was observed in 1970 in the United States, and it has since grown into a worldwide movement involving more than 190 countries. Earth Day encourages individuals, communities, governments, and organizations to take action to protect the environment through activities such as tree planting, recycling, clean-up campaigns, and environmental education.