Britain should be prepared to scrap its nuclear deterrent, a group of generals write in The Times today, pushing the future of Trident to the forefront of the election.

A photographer travels on the Rainbow Warrior as it tries to prevent illegal tuna fishing. Features a photo essay and audio slideshow.

Talk of British sovereignty is laughable. We will blow billions on a nonsensical nuclear deterrent unless the US acts to disarm.

The US-Russia pact offers Britain a chance to delay any decision on renewing its nuclear deterrent rather than pushing ahead with an expensive plan to replace a fleet of Trident submarines, analysts said.

Traditional tuna fishing in the Maldives uses pole and line rather than nets, and the British market has become essential to the Maldivian economy.

Former chief of the defence staff says plans to replace Trident should be abandoned and troop numbers increased.

Nuclear missile system is the weapon 'least likely' to be used by UK forces in future conflicts, say senior military sources.

Environmental group says the plan will create a legal headache for any government pushing ahead with airport's expansion

World temperatures are on course to rise 6C by the end of the century because of global warming, a major British study has forecast.

Joss Garman from the Greenpeace climate campaign explains why Europe needs to take the lead and face down Barack Obama's 'no we can't' attitude on agreeing a climate change deal.

This week, lifelong human rights activist Kumi Naidoo takes over as international executive director of Greenpeace. Here, he explains why he is making the jump to a mainstream environmental organisation, and what role he sees for organisations such as Greenpeace in the modern world.

End of the Line author Charles Clover comes to Brazil, to see how ICCAT works… and he’s spitting through his caipirinhas.

Actors, politicians and the country's leading poet planted an orchard on the site of the proposed third Heathrow runway during a protest on Friday. Actors Alison Steadman and Richard Briers, Lib Dem leader Nick Clegg and Poet Laureate Carol Ann Duffy joined residents and activists.

The international commission that sets fishing limits for tuna and other large migratory fish is meeting in Brazil. The commission faces a depressing reality: the bluefin tuna in the eastern Atlantic and Mediterranean is headed toward commercial extinction.

The BBC is to change its policy on food served up on MasterChef after conservationists accused it of putting an endangered species on the menu.