Gary Blumenthal wrote yesterday about the trend toward carbon labels on food products. To facilitate that, the Senate is expected to vote this week on the Growing Climate Solutions Act. That proposal already passed the Senate Agriculture Committee unanimously.   Specifically, the bill would direct USDA to establish a program to certify entities that provide technical assistance to, and verify the practices of, farmers, ranchers, and foresters who participate in voluntary markets that trade credits for reducing greenhouse gases (for example, carbon markets sponsored by private companies). It would also require USDA to audit those entities, establish an advisory council for the program, and coordinate with the Environmental Protect...