Energy-saving technologies keep improving faster than they're applied, so efficiency is an ever larger and cheaper resource.

I'm not an environmentalist. I'm a cultural repairman. It's all about efficient and restorative use of resources to make the world secure, prosperous and life-sustaining.

I'm a practitioner of elegant frugality. I don't feel comfortable telling other people what to do, so I just try and lead by example.

I am a man without a furnace. My windows are insulated by 19 sheets of glass which cost less than installing a heating system.

We are already experiencing the symptoms of climate change, especially with a hotter and drier climate in southern Australia - the rush to construct desalination plants is an expensive testament to that.

Every decision we make - when we choose a vehicle, when we pump gas into that vehicle, when we order food - is not just a personal lifestyle choice. It's an environmental and moral choice.

Every time I have some moment on a seashore, or in the mountains, or sometimes in a quiet forest, I think this is why the environment has to be preserved.

Every state that addresses climate change emboldens the others, just as shifting public attitudes embolden politicians and, arguably, the court system.