She may seem the most electable Democratic hopeful, but can voters be persuaded to trust her?
Some climate change deniers in the United States Senate have realised they are increasingly out of step with the public.
Leading scientists have complained that a Wall Street Journal article disputing climate change is akin to "dentists practising cardiology".
Environmental groups have praised US President Barack Obama's move to limit uranium mining near one of the world's natural wonders, the Grand Canyon.
Scientists are urging Canada to end its commercial seal hunt after declining ice cover from climate change sends death rates among seal pups soaring.
An Oceana report says most shark species are heading towards extinction, while many are still being caught and killed.
The international community has "made a mistake" with the intensity of its focus on the global HIV/Aids epidemic and lost ground on family planning.
United States airlines are wrong to think that they can force the European Union to back down on plans to make carriers pay for emitting carbon.
Nepal wants to lift itself out of poverty by expanding its tourism industry but there is no strategy for waste disposal
The Empire State Building announced it would meet all its electricity need with wind power.