Australian Broadcasting Corporation: Trade Minister Craig Emerson says he is concerned that some countries may use the issue of climate change as an excuse to put up trade barriers. British climate change economist Nicholas Stern says countries that do not put a price on carbon risk being shut out of world markets. But Dr Emerson has told Sky News that the Federal Government will not put up with old European trade barriers being veiled by a “green cloak”. “Of course we are committed to putting a price on …