By Siau Ming En Despite concerns repeatedly voiced that a carbon tax could dent competitiveness, there is no evidence it has led any company to move out of a country, said a panellist at a Singapore International Energy Week discussion. Forty-seven countries and states today have some form of carbon pricing, such as a carbon tax or an emissions trading scheme. Prices range from US$1 to US$140 per tonne of emissions, noted World Bank senior carbon finance specialist Wang Xueman. Asked…