Environmentali sm is really about seeing our place in world in a way that humans have always known up until very recently - that we are part of nature-utterly dependent on the natural world for our well being and survival.

Faced with the evidence, many deniers have started to admit that global warming is real, but argue that humans have little or nothing to do with it.

It is clear that while science provides insights into the complexity of the world around us, those insights...present a fractured mosaic rather than a seamless whole. There are profound limits to science that must be recognized if we are to minimize the destructive consequences of using the powers provided by scientific discovery.

We have become a force of nature.

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.

Planting native species in our gardens and communities is increasingly important, because indigenous insects, birds and wildlife rely on them. Over thousands, and sometimes millions, of years they have co-evolved to live in local climate and soil conditions.

With an estimated population of nine billion people by 2050, we cannot continue to consume resources at the same rate and maintain our quality of life.