I've always been torn between the pure and the social sciences.

Human activity is having a major impact on the planet. We consume or have diverted a large proportion of the productivity of the land and oceans. Our hunger for land crowds out fellow species. Our waste products pollute the waters, warm the atmosphere and acidify the oceans.

Global actions require local and national participation. International cooperation and action requires community perspectives and legitimacy if it is to be effective.

People often focus on the downsides of population growth but neglect the upsides. These upsides may even outweigh the downsides, making a larger population a good thing overall.

Our democracy works because the parties air and debate their differences in public.

When it turns out that you were supposed to be disclosing all these foreign government donations to the Clinton Global Initiative while you were Secretary of State, and you didn't, and now the Clinton Global Initiative is having to restate their 990s, that doesn't sound very trustworthy to me.

I'm in politics to make the lives of millions of Indians better.

This Government has found occasion to express, in a friendly spirit, but with much earnestness, to the Government of the Czar, its serious concern because of the harsh measures now being enforced against the Hebrews in Russia.