Hi Tina, (1) a 'fast track' is a streamlined or expedited way of accomplishing a process, task or goal. In this case, the US and other nations will try to deal with the problem of West African cotton subsidies before or quicker than they consider other related problems. 'Separate' means separately from these other considerations, and is not really necessary in this sentence.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.