In the late 1960s, there were alarming predictions that worldwide famine was around the corner. I wondered if humans had already lost the race, overrun the Earth's capacity. I let one question lead to the next, and unearthed information that would forever change my life: Not only is there enough food in the world to feed every man, woman, and child on Earth, there is enough to make us all chubby.

We got hooked on grain-fed meat just as we got hooked on gas guzzling automobiles. Big cars made sense only when oil was cheap; grain-fed meat makes sense only because the true costs of producing it are not counted.

The real cause of hunger is the powerlessness of the poor to gain access to the resources they need to feed themselves.

I read a book in the late 1990s called The Anatomy of Human Destructiveness, by Erich Fromm, and it had a profound impact on me. Fromm takes Descartes' statement, "I think, therefore I am" and changes it to "I effect, therefore I am."

I also believe that it's almost impossible for people to change alone. We need to join with others who will push us in our thinking and challenge us to do things we didn't believe ourselves capable of.

Recent breakthroughs in science show we have just the capacities we need to face our planet's challenges. We're "soft-wired" for cooperation, empathy, fairness, along with a deep need to "make a dent," as social philosopher Erich Fromm put it. My hunch is that one reason depression is a global pandemic is that the dominant mental map denies so many of us expression of these deep needs and capacities.

Engagement is the good life. What could be more exciting than getting involved in something that you care about and joining with others and seeing something change? What could be more thrilling?