Business Green: It may be in the midst of cutting 10 per cent of its workforce and halting bonuses for senior executives, but that has not stopped investment bank Goldman Sachs continuing its push into the carbon credit market with the announcement of its second acquisition in as many weeks. Following hot on the heels of its purchase of an equity stake in US-based offset specialist Blue Source, the company announced last week that it has agreed to buy the majority of the carbon offset portfolio …