To compensate for every pollution-spewing private jet ride he takes, Gov. Arnold Schwarzenegger wants to plant or protect trees. He is beginning his effort with the Fred M. van Eck Forest Foundation, which has 2,100 acres in Humboldt County. This "off-set" is designed to make Schwarzenegger carbon neutral - it effectively reduces the amount of global warming gases his travel is producing. ... But he might want to read a report by the Carnegie Institution and the Lawrence Livermore National Laboratory. They found that planting and protecting forests in subarctic Boreal zones may actual contribute to global warming. And they...