When I was growing up, my parents told me, 'Finish your dinner. People in China and India are starving.' I tell my daughters, 'Finish your homework. People in India and China are starving for your job.'

When I think back on my favorite teachers, I don't remember anymore much of what they taught me, but I sure remember being excited about learning it. What has stayed with me are not the facts they imparted, but the excitement about learning they inspired.

We've gone from thinking the fuels that powered our growth were inexpensive, inexhaustible and benign to understanding they are exhaustible, expensive and toxic. Once you frame the problem that way, people will look at solutions differently.

The Dell Theory of Conflict Prevention argues that no two countries that are both part of the same global supply chain will ever fight a war as long as they are each part of that supply chain.

Tel Aviv is new, built on the sand dunes north of Jaffa in the 1890s, about the same time Miami was founded. The cities bear a resemblance in size, site, climate, and architecture, which ranges from the bland to the fancifully bland.

A knowledgeable and courageous U.S. president could help enormously in leading the world's nations toward saving the climate.

We the people have the strength to bring our country from our weak-kneed stumbling gait in the last ranks of reason to the leadership of the great march to environmental victory.

A lot of money could be saved if we ate urban wildlife.