The 50th anniversary of Earth Day is today.

The theme of this year’s celebration is the climate, which in terms of change has been a key political and environmental topic of recent years.

It’s been a topic, as well a debate, as to whether the climate is changing and, if it is, how it’s changing and what might need to be done in response to the changes.

Certainly, climate changes like most things. It’s changed for decades and likely centuries. That change, however, has been more pronounced in current times.

Earth Day started as a response to environmental concerns — pollution of the land and sea. It was the beginning of the environmental movement.

It led to Clean Air, Clean Water and Endangered Species acts in the United States.

The Environmental Protection Agency was established Dec. 2, 1970. It came as a result of President Richard Nixon’s creation of an Environmental Quality Council, a cabinet advisory group to focus on the government’s response to pollution.

Earth Day conjures up different ideas. Some respond with marches and protests, both of which are unlikely while the worldwide novel coronavirus continues. Others think of Earth Day as a reminder to pick up litter in big and small communities.

Given that this is the only Earth, it makes sense to attribute a day to it and to be responsible in its care.