The goal of each EarthEcho Expedition is to inspire and empower youth around the world with the knowledge and tools to take an active role in protecting critical natural resources in their own communities.

Growing up with my father's legacy, we never felt that we had to do anything, but we were always raised to think: What could be better than to explore the wonders of the world and share that with people? To try and make the world a better place. And I guess it stuck.

Sumatra has these lush forests and huge, amazing creatures like elephants, orangutans, and tigers. They're disappearing because of industry coming in and cutting down the forests.

The fact of the matter is our homes are on the frontlines when it comes to protecting and conserving our critical water resources - more than that, they are also key to protecting our health.

The planet's biggest problems have to do with sustainability, environmental decline, global poverty, disease, conflict and so forth. Really, they're all interconnected - it's one big problem, which is that the way we're doing things can't go on.

Just eat less and exercise more.

Positive health means becoming whole-heartedly engaged with our own health care. It means not outsourcing our health to the health care system. It means getting rid of the fear and paralysis we too often feel, and instead cultivating a sense of agency.

David Gulden captures animals in all their wonder and intrigue, without glorifying or romanticizing them. He knows Kenya's wildlife intimately, and it shows in the depth of his images. He has an artist's eye, which delivers beauty and transport in every picture.