Learn
Dig around the web, read some books, watch some videos, do some research. Look for people that are paving the way like Ben Falk, Richard Perkins, Geoff Lawton, Bill Mollison, Masanobu Fukuoka, John Liu, Jadav Payeng (Forest Man). Look for subject matter under permaculture, edible food forests, no-work gardening, clay seed balls, seed bombs, guerrilla gardening. There are lot of great ideas out there.
Getting into the mechanics of the way we garden and farm, a major shift is going to be an environmental necessity. We have been in the habit of extracting without replenishing.
Every project, no matter how small or how large, starts with one person making the decision to change.
Sunflower Seeds Germination Time Lapse by Temponaut
Moving Art- The Beauty of Pollination by Louie Schwartzberg
Why Bees Are Disappearing- Marla Spivak
National Geographic- A short film on reclaiming a wasteland in Texas.
Forest Man- Jadav Payeng planted a forest larger than Central Park.
National Geographic- Iceland Is Growing New Forests for the First Time in 1,000 Years
Nature- What Plants Talk About
Re-greening the Desert by John Liu
Lessons of the Loess Plateau by John Liu
Forests Keep Drylands Working- John Liu
One Straw Revolution- by Larry Korn