A British university is saying that another batch of emails has been released that are similar to those that caused a global climate controversy in 2009.

Climate scientists have emerged from an inquiry with their reputations still intact.

Over 250 scientists in the US defended climate change research on Thursday against "political assaults," while at the same time warning that any delay in tackling the issue heightens the risk of a planet-wide catastrophe.

Scientists at the University of East Anglia's Climatic Research Unit (CRU) have been cleared of intentional wrongdoing in the "Climategate" scandal by an independent review panel.

A committee has found no evidence that climate researchers at University of East Anglia's Climatic Research Unit manipulated data.