Gee does this mean carbon credits are not all they are cracked up to be?

Trees Won't Fix Global Warming

Andrea Thompson
LiveScience Staff Writer

The plan to use trees as a way to suck up and store the extra carbon dioxide emitted into Earth's atmosphere to combat global warming isn't such a hot idea, new research indicates.

Scientists at Duke University bathed plots of North Carolina pine trees in extra carbon dioxide every day for 10 years and found that while the trees grew more tissue, only the trees that received the most water and nutrients stored enough carbon dioxide to offset the effects of global warming.

The rest.