DFW is competing with 70 cities globally to record most observations of nature April 27-30.
Filmmaker Chris Jordan recently screened his film in Dallas about the Midway Island albatross.
The Human Element will show again on April 20 at the Women's Museum at Fair Park.
The three-day environmental expo also features five days of conferences and a 10-day film festival.
The Native Neighborhoods event will be held Saturday, April 21.
The fourth annual Run for Environment kicked off the 11th annual Oak Cliff Earth Day.
Sandra Steingraber will be speaking in Fort Worth and Dallas on April 21.