Business Green: A UN committee has today recommended that the world’s governments introduce new taxes on carbon allowances and financial transactions to help raise the $100bn a year pledged at last year’s Copenhagen Summit to help poor countries cope with the effects of climate change. The UN Secretary-General’s High-level Advisory Group on Climate Change Financing (AGF), comprising 21 members including British climate secretary Chris Huhne, international financier George Soros and influential economist Lord…