And that, quite simply, is the issue. We live in a finite world with finite resources. Although it may sometimes seem quite big, earth is really very small - a tiny blue and green oasis of life in a cold universe.

There is a gyre of discarded floating plastic the size of the continental USA in the ocean. In it, plastic trash outweighs plankton 40 to 1.

If all humans disappeared today ,the earth would start improving tomorrow.If all the ants disappeared today ,the earth would start dying tomorrow.

Treaties, agreements and organizations to help settle disputes may be necessary, but they often favor the interests of business over citizens.

Think about a seed. Once it lands, it's stuck. It can't move to find better soil, moisture or sunlight. It's able to create every part of itself to grow and reproduce with the help of air, water and sun.

One of the joys of being a grandparent is getting to see the world again through the eyes of a child.

If we want to move towards a low-polluting, sustainable society, we need to get consumers to think about their purchases.