The price tag for tackling climate changes goes up every year, warns Stephan Lewandowsky.

From every perspective other than the purely short-term commercial, biofuels make little sense, warns Nick Rose.

Cycling needs better support from infrastructure and society in order for it to become a popular, green and healthy mode of transport, according to research.

Acid oceans are the elephant in the room of global change – an event potentially so massive and profound in its implications for life on Earth that the world media has largely avoided it, governments shunned it and scientists discussed it mostly in muted tones, usually behind closed doors.

Whichever party wins the election, the Australian Government must give our fair share to developing countries for climate change, according to Andrew Hewett.

Protecting Australia’s forests would be a vital act of good faith to convince the world we are serious about offsetting global carbon emissions, according to Will Mooney.

As individuals, communities, countries and governments, we must play our part in cleaning up our energy consumption, warns Dominique La Fontaine.

Australian law needs to recognise greenhouse gas emissions as a matter of environmental significance, writes Karen Bubna-Litic.

Taxpayer-funded health systems were created in an age when medicine was rudimentary and inexpensive, the old died relatively young, and doctors mainly saved people from misadventure rather than from the consequences of their lifestyle choices, warns Jeremy Sammut.

Early intervention for depression and other emerging serious mental illness is a key under-explored strategy, says Professor Patrick McGorry.

A comprehensive strategy that involves water recycling, urban runoff and desalination, together with an appropriate pricing structure must be undertaken, according to Associate Professor Hector Malano.

Pests, diseases and climate change know no boundaries, according to Emile Frison.

Complex and overlapping federal and state privacy provisions are jeopardising medical research and basic health care, according to Professor Loane Skene.

Australia should be a global and regional leader in addressing climate change, by ratifying the Kyoto Protocol and introducing policies to reduce national greenhouse gas emissions by at least 60 per cent by 2050, according to Professor David Karoly.

Australia needs a concerted and considerable investment in primary care clinical based research if it is to deal with future health care demands, according to Jane Gunn.