Costing the Earth? The Quest for Sustainability
We exist because the Sun is. It was 5 billion years ago that the Sun "turned on" and scientists estimate that there is another 5 billion years of life left in the Sun. We live in the midpoint of its life; at its noonday. It is a star - it is our star - it is our daystar. It's not the biggest nor the smallest of the 200 billion stars even in our galaxy - but to sustain life on Earth, it is just right.