Miners' attack on Yanomami Amazon tribe 'kills dozens'

An attack by gold miners on a group

Virginia's dying marshes and climate change denial

      'Ghost trees' are victims of rising sea levels  

Dying wetland trees along Virginia's

coastline are evidence that rising sea levels threaten nature and humans, scientists say - and show the limits of political action amid climate change scepticism. Dead trees loom over the marsh like the bones of a whale beached long ago. In the salt marshes along the banks of the York River in the US state of Virginia, pine and cedar trees and bushes of holly and wax myrtle occupy small islands, known as hummocks. But as the salty estuary waters have risen in recent years, they have drowned the trees on the hummocks' lower edges. If - when - the sea level rises further, it will inundate and drown the remaining trees and shrubs, and eventually sink the entire marsh. That threatens the entire surrounding ecosystem, because fish, oysters and crabs depend on the marsh grass for food.

At the Planet Under Pressure conference in London, Diana Liverman and Will Steffen present something of a contrasting couple.

The two professors have been working together on a State of the Planet report, which has involved trawling through numerous reports and scientific papers. At the end of it all, the message of one appears somewhat optimistic, the other fundamentally pessimistic. They agree that changes to the world since about 1950 have been startling - rapid spread of the human population, accelerating exploitation of forests and marine resources, surging economic growth in successive waves across the world, and so on. This radical reshaping of the natural world by a single species is certainly unprecedented in Earth history, which a few years back led to scientists Paul Crutzen and Eugene Stoermer coining a special name for our epoch - the Anthropocene.

The Brazilian Chamber of Deputies has

Should the location of newly discovered species be hidden?

Discovering a new species can be the defining moment of a biologist's career, but for some it can also mean exposing rare and vulnerable animals to the dark world of the wildlife pet trade, with catastrophic results. It's a scientific dilemma that has led some conservationists to question whether it would be better to hide their findings from the world. In 1999, herpetologist Bryan Stuart was working in Northern Laos when he stumbled across an eye-catching newt he had never seen before. The creature was prehistoric in its appearance with thick, warty skin and bright, yellow dots all the way down its back. He spotted it in a bottle of alcohol that a Lao colleague had brought back from a wedding in a remote part of the country - the poison from the newt's skin had been used to make a drink with special medicinal properties for a toast to the newlyweds. Stuart went in search of the newt in the wild and three years later he published an article in the Journal of Herpetology, announcing the discovery of the new species, Laotriton laoensis.