Solar power is one of the most hopeful technologies but still produces about 0.01 percent of U.S. electricity. The U.S. allocates just $159 million for solar research per year - about what we spend in Iraq every nine hours.

While Americans have heard of Darfur and think we should be doing more there, they aren't actually angry at the president about inaction

Palestinian militancy has accomplished nothing but increasing the misery of the Palestinian people. If Palestinians instead turned more to huge Gandhi-style nonviolence resistance campaigns, the resulting videos would reverberate around the world and Palestine would achieve statehood and freedom.

If the U.S. wants to help people in tsunami-hit countries like Sri Lanka and Indonesia - not to mention other poor countries in Africa - there's one step that would cost us nothing and would save hundreds of thousands of lives. It would be to allow DDT in malaria-ravaged countries.

Solar power is one of the most hopeful technologies but still produces about 0.01 percent of U.S. electricity. The U.S. allocates just $159 million for solar research per year - about what we spend in Iraq every nine hours.

It’s time for a 21st-century abolitionist movement in the U.S and around the world.

Half a million women die each year around the world in pregnancy. It's not biology that kills them so much as neglect.