Reuters: Britain threw its weight on Saturday behind proposals to impose a global levy on banks to fund future bailouts and called on the G20 to work toward a $100 billion deal to meet the cost of climate change. A draft end-of-meeting statement from the group of rich and developing nations obtained by Reuters said the economy had improved but cautioned recovery was still dependent on the official support given to it since the financial crisis erupted last year. Policymakers also …