I read that. For those who did not, here's the essence:
Together the two studies offer sweeping conclusions: It does not
matter if it is rain forest or scrubland that is cleared, the
greenhouse gas contribution is significant. More important, they
discovered that, taken globally, the production of almost all biofuels
resulted, directly or indirectly, intentionally or not, in new lands
being cleared, either for food or fuel.
“When you take this into account, most of the biofuel that people are
using or planning to use would probably increase greenhouse gasses
substantially,” said Timothy Searchinger, lead author of one of the
studies and a researcher in environment and economics at Princeton
University. “Previously there’s been an accounting error: land use
change has been left out of prior analysis.”