Carbon Positive: Opposition is mounting within financial markets against curbs to market trading contained in the proposed US Senate climate bill, unveiled last week. The International Emissions Trading Association (IETA) and the NYMEX Green Exchange have criticised the provisions as counterproductive. The Kerry-Lieberman bill calls for maximum and minimum prices to be set for the carbon allowances issued under a cap and trade scheme to curb market volatility. They start at $12 and $25 and are indexed …