PJ is quoting Bjorn Lomborg, the political scientist whose forays into environmental economics are marked by too many errors and blunders to count. There is literally a book on his errors, and a separate website focused on two of his better-selling books, http://www.lomborg-errors.dk/

As that website notes, "...because the errors seem not to be inadvertent, but to follow a general pattern, they give a bias in a certain direction, probably an intended bias"