Reuters: Norway’s hopes of supplying cleaner electricity to offshore oil and gas platforms to help fight global warming suffered a setback on Friday when an official report projected higher-than-expected costs. The study estimated it would cost at least 1,600 crowns (US$299) to cut a tonne of carbon dioxide emissions by shutting down offshore power generators run on fossil fuels and laying cables from the mainland, where most power is hydro-electric. By contrast, rights to emit carbon …