Sydney Morning Herald: THE world’s biggest mining company has urged Julia Gillard and Tony Abbott to act on climate change ahead of other countries, warning that Australia’s economy will suffer unless it looks to a future beyond coal. In a dramatic intervention into the stalled climate debate, BHP Billiton chief executive Marius Kloppers yesterday called for ”a clear price signal” on carbon dioxide emissions, possibly including both a carbon tax and a limited carbon trading scheme covering power …