Carbon Positive: Two separate studies have thrown doubt over forests’ ability to help offset global warming. Because trees rely on carbon dioxide to grow, it has been predicted that as CO2 levels rise in a warming world, trees would thrive on the increase, grow faster, and thus help soak up excess atmospheric carbon. As a result of their findings, the authors of both studies have called into question the growth models for worldwide vegetation being used in official climate change forecasting for this century….