Xinhua: UN Secretary-General Ban Ki-moon and former U.S. Vice-President Al Gore on Tuesday called on the world to use the coordinated economic stimulus urgently needed to tackle the global economic crisis to launch a long-term 21st century revolution of green growth. Such a stimulus package would not only jump-start the economy on a path that leads away from the use of global warming fossil fuels by eliminating their subsidies in developed countries, but would also help poor nations develop …