Loane Skene finds the pronouncements in Margaret Somerville's new book, The Ethical Imagination: Journeys of the Human Spirit, too absolute, yet logically developped and clearly advanced.

Converting gas, coal or biofuel to liquid could provide a significant guaranteed contribution to Australia's energy supply, according to Dr David Trimm.

Wildlife can only move around to fresh habitats if vegetation remnants are physically linked.

The causes of the hyper bushfires of recent years have nothing to do with climate change but everything to do with the forest mismanagement, according to John Cribbes.

Strategic vision, leadership and urgent action on climate change is essential, according to Acacia Rose.

There has been little consideration about how fair the impacts of our policy responses to climate change will be, says Christian Seibert.

Going into space may be one of the best things we can do to save our planet, and ourselves, according to Wilson da Silva.

Spare a thought for the communities in developing countries in which less reputable mining companies now operate, says Andrew Hewett.

It is time to admit how little we know and face the risks of planetary degradation, according to Professor Graham Harris.

It is not too late for Australia to regain its position as a major commercial player in the solar power industry, according to Martin Green.