Hindu: Three weeks ahead of the Cancun Climate Change Conference, a high-level UN advisory group has presented a report with suggestions to come up with $ 100 billion a year by 2020, including tax on international flights, for poor countries to combat global warming. The 21-member advisory group is co-chaired by Prime Ministers Meles Zenawi of Ethiopia and Jens Stoltenberg of Norway. The group was set up in February and includes Deputy Chairman of the Planning Commission Montek Singh Ahluwalia, philanthropist…