The retirement of old nuclear power plants in the coming years could compromise the international effort to arrest the rise in global temperatures and result in an increase in carbon emissions instead, the International Energy Agency has warned in a new report. Nuclear is one of the lowest-emissions sources of energy but it has a bad reputation, which has prompted Germany, for example, to greatly reduce its operating nuclear capacity and replace it with renewables and, mostly, natural gas. France also had an idea to start phasing out the nuclear…