Deputy Prime Minister Nick Clegg enjoyed some positive limelight in June, announcing at the Rio+20 Summit the UK government’s plan to introduce mandatory reporting of greenhouse gas (GHG) emissions. However, the use of differing terminology in various government information sources at the time of the announcement has led to some confusion about exactly how many companies might be affected – whether just those with shares traded on the main market of the London Stock Exchange (LSE), or debt issuers as well. It is also unclear whether the small number of UK companies with shares listed elsewhere in Europe or the US, but not in London, will be caught.