Also by John Sauven

Our Executive Director John Sauven, writing for comment is free explains why tuna, once the 'chicken of the sea', is now at grave risk from overfishing.

The MV Esperanza confronts overfishing and pirate fishing in the Pacific.

Tuna, particularly the canned variety, has long been one of the UK's staple foods and most of us probably have a couple of tin or two somewhere in our cupboards. More recently, we've been developing a taste for raw tuna, as sushi bars continue to spread throughout the country.

The cost of taking nuclear plants out of service is spiralling out of control. Is this just poor financial management, or does it have wider implications? Written by Greenpeace Executive Director John Sauven for comment is free.

This week, the National Audit Office released its damning assessment of the Nuclear Decommissioning Authority's (NDA) ability to estimate the true financial cost of decommissioning and cleaning up the UK's fleet of ailing reactors and contaminated facilities. As costs for decommissioning appear to spiral out of control - rising sharply from £56bn to £73bn over just a few years - the burden on the taxpayer grows ever more. And it doesn't end there. The NDA has also been made responsible for disposing of the UK's stockpile of legacy wastes which is estimated at an additional £10-20bn. The industry argues these increased costs have arisen in the face of "significant challenges", but the echoes from this announcement are all too familiar from a sector that has been plagued with industrial and financial incompetence.

On Tuesday, Gordon Brown announced his government’s support for a new generation of nuclear power plants. In so doing, he casts himself in the role of the bold leader, taking tough decisions for the common good.

Certainly The Sun has bought it wholesale, shrieking: ‘Britain’s security will be in peril if we continue to rely on Russian despot Vladimir Putin or Middle Eastern states for our gas and oil.’

John Sauven, our executive director,writing in The Guardian on why Gordon Brown's reluctance to embrace the economic and environmental potential of renewable energy technology is costing us time, money and could eventually cost us the climate.

At the centre of Britain's efforts to tackle climate change are targets for renewable energy, energy efficiency and ultra-efficient combined heat and power (CHP) plants.

Yet as warnings about the impact of global warming grow more severe, every single one of those targets is projected to be missed or has already been abandoned.