Sacramento Bee: The Humboldt County forest that has been one of the country’s highest-profile sources of "carbon offsets" has logged its largest sale ever, a deal the forest’s managers say demonstrates the market’s confidence in the value of their product. Natsource Asset Management LLC, a New York firm that deals in credits for greenhouse gas emissions reductions and renewable energy development, purchased 60,000 tons of carbon dioxide emissions reductions from the Van Eck Forest for an …