Addressing AGW and pollution go hand in hand. Unfortunately for your argumentation, very few problems we have currently exhibit runaway buildup patterns, whereas AGW does. If we do not address global warming quickly and decisively, we flat out won't be able to fix it before a large portion of humanity is affected in a severe fashion. Yes, we should also help the poor and the hungry, cure diseases and many more things besides, but none of those have a harsh deadline attached to them. Moreover, none of this is a zero-sum game: people working on AGW wouldn't be working on cancer no matter what your desires and funding priorities are.