Rich nations promised more than $1.5 billion on Monday to start the long process of rebuilding Afghanistan as aid agencies within the country launched a campaign to save thousands of Afghans from starvation. Afghanistan's interim leader, Hamid Karzai, appealed to the world Sunday for help in getting his devastated country back on its feet after two decades of strife and disaster that created a breeding ground for terrorism. Officials from more than 60 governments and international organizations met in Tokyo to discuss Afghanistan reconstruction process that aid experts estimate will take $15 billion over a decade, much of it in the initial stage.