There are no separate systems. The world is a continuum. Where to draw a boundary around a system depends on the purpose of the discussion.

Denmark, the Netherlands and Germany have detailed plans to cut their greenhouse emissions by 20 to 50 percent.

There have been high crimes and misdemeanors, but they have been committed by the special prosecutor and the Congress, not the president.

A grand jury hears only one side - that of the prosecutor

Scientists worldwide agree that the reduction needed to stabilize the climate is actually more like 80 percent.

You may be able to fool the voters, but not the atmosphere.

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

Calculating how much carbon is absorbed by which forests and farms is a tricky task, especially when politicians do it.

We can't control systems or figure them out. But we can dance with them!

Glaciers are almost gone from Glacier National Park

There is too much bad news to justify complacency. There is too much good news to justify despair.

Our kindness may be the most persuasive argument for that which we believe.

Expect trouble as an inevitable part of life, and when it comes, hold your head high, look it quarely in the eye and say, 'I will be bigger than you. You cannot defeat me.

Don't look around for the path you are meant to follow, forge it yourself.

We kill at every step, not only in wars, riots ad executions. We kill every time we close our eyes to poverty, suffering and shame.

Enjoy your sweat because hard work doesn't guarantee success, but without it you don't have a chance.

The human soul needs actual beauty more than bread.

How many theorems in geometry which have seemed at first impracticable are in time successfully worked out!

The only thing a star asks is to be allowed to twinkle.

Discipline is doing what you are supposed to do in the best possible manner at the time you are supposed to do it.

Our future lies with today's kids and tomorrow's space exploration.