Reuters: US carbon asset manager Natsource LLC said on Monday it has invested in the first forest-based greenhouse gas emissions reductions under California rules. Natsource paid a private owner of a redwood forest in Humboldt County represented by nonprofit group the Pacific Forest Trust for credits representing 60,000 tonnes of carbon emissions. The company declined to say how much it paid for the credits, but a source familiar with the deal said Natsource bought the credits for …