Progressive taxation can offset the effect of growing inequality.

Here's something we're rarely told growing up: our world rewards wealth, not hard work or talent.

For me, growing up as an activist under an oppressive dictatorship in Uganda, the U.N. was a friend to those of us who fought our way to freedom, as it was for the millions who joined decolonization struggles in the African continent.

The world belongs to the wealthy, and nowhere is this injustice more apparent than in the workplace.

All the major problems of the world today are global in essence, and they cannot be solved unless through some kind of global cooperation. It's not just climate change, which is, like, the most obvious example people give. I think more in terms of technological disruption.

Through space-based climate studies, my colleagues and I have learned that a stable and comfortable climate is not something to take for granted.

Bindi's really, you know, got her own goals and aspirations, and if I can nurture what Bindi loves, then I think I'm being a good parent. Because Bindi's got a natural love for wildlife, I think that will be part of what we're nurturing.

Look at the bark of a redwood, and you see moss. If you peer beneath the bits and pieces of the moss, you'll see toads, small insects, a whole host of life that prospers in that miniature environment. A lumberman will look at a forest and see so many board feet of lumber. I see a living city.