My favorite sign here says, "I care about you." In a culture that trains people to avoid each other's gaze, to say, "Let them die," that is a deeply radical statement.

Our enslavement to oil has required the repression of millions of Arab people. As they shake off their bonds, so must we.

But we need to be very clear: because of our decades of collective denial, no gradual, incremental options are now available to us.

We can't leave everything to the free market. In fact, climate change is, I would argue, the greatest single free-market failure. This is what happens when you don't regulate corporations and you allow them to treat the atmosphere as an open sewer.

A term like capitalism is incredibly slippery, because there's such a range of different kinds of market economies.

So we are left with a stark choice: allow climate disruption to change everything about our world, or change pretty much everything about our economy to avoid that fate. But we need to be very clear: because of our decades of collective denial, no gradual, incremental options are now available to us.

Africa is poor because its investors and its creditors are unspeakably rich.