Carbon Positive: Carbon traders will be watching closely this week to see how much of its April gains the EU carbon market can hang onto after the resurgence of the past month was halted last week by global financial market nervousness. EUA prices fell sharply on Friday as the sovereign debt crisis in Southern Europe intensified. But prices remain close to the top of the benchmark range over the past year. The Dec 10 EUA contract closed at EUR15.54 on Friday on the European Climate Exchange, down more …