Guardian: For the first time since 2007, the big business story of this summer has got nothing to do with banks. Nor does it feature state-of-the-art financial wizardry. No, the real runner on the business pages this month, the major news that has got people in the City and on Wall Street talking, concerns fertiliser. Whichever astute equity analyst came up with the one about how where there’s muck there’s brass probably did not estimate that it would involve £25.8bn worth of brass. But that is …