1%

The UK has (in round figures) 28m households, whose average net income is £38k. Total household income is thus £1tr. One percent of that is £10bn which would go a long way to feed the world's starving. The average household would give just a pound a day. Become one of the 1%. Please set up a direct debit for 1% of your takehome pay. You'll scarcely notice the difference to your life but the people whom you save from starvation will.