Geoff Russell writes: Re. "The Power Index: our long list of carbon cutters" (yesterday). Cutting carbon? Australia? Is that a joke? What were Australia's CO2 emissions per kilowatt hour of electricity in 1990? According to the International Energy Agency, they were 817 grams of CO2 per kWh. And in 2010? 841 grams of CO2 per kWh. We have gone backwards in what will be the critical energy source of coming decades. Our major reductions in emissions have come by the sheer accident of having the bottom fall out of the wool market in 1990, and our 170 million sheep dropped to just 70 million now. If we hadn't increased the cattle population, we'd have had even deeper savings.