Unlike the organizers of the first Earth Day. environmental activists today are mainly focused on

The first earth day is celebrated on 22nd April. The modern environmental movement is celebrated in the 1970 s.

Explanation:

The earth day in 1970 makes people conscious about the state of our planet, This modern day of earth provide the voice to the people about the consciousness of environmental concern.

Gay Lord Nelson was a junior senator from Wisconsin was much concerned about the deteriorating position of environmental conditions. He started the earth day on 22nd April. Hayes was another person who spread a campaign.

This campaign focused on global warming and increase clean energy. But now these days the earth day has seen as a secular observance for every world, It marked more than a million of the people every year changes the human behavior.