Guardian: Money paid by rich countries to fight global warming will have to “be scaled up” from the $100bn a year on offer, the UN secretary general Ban Ki-moon said today. Finance is the key, said Ban, to successful negotations on a global treaty to fight climate change, due to conclude at UN talks next month in Copenhagen. Ban also revealed that he will next week meet all the US Senators involved in deliberations over the energy and climate bill. Agreement on that bill is seen as vital …