Final answer:
The NYC event in 2014 that is a great example of how environmental activism can form communities is Earth Day.
Step-by-step explanation:
The NYC event in 2014 that is a great example of how environmental activism can form communities is Earth Day. Earth Day was first observed in 1970 and is celebrated every year on April 22. It started as a grassroots movement organized by students and faculty at the University of Wisconsin and has grown into a global event with more than 300 million people participating.