Human-induced temperature increase is amplified in the Arctic, as well as its effects on the ice cover. With the aid of an Arctic "death spiral”, Prof. Peter Wadhams, oceanographer and glaciologist at Cambridge University, discusses scientific evidence and his personal experience of changes in...

Many international policies encourage a switch from fossil fuels to bioenergy based on the premise that its use would not result in carbon accumulation in the atmosphere. Frequently cited bioenergy goals would at least double the present global human use of plant material, the production of...