Malaria kills half a million people every year and 400 million fall ill. Before bed nets were made available, it was three or more times that. Nets are a proven intervention - a more effective a way of saving lives than any other. There is still a long way to go and every death from malaria is preventable.
Given the scale of this problem, malaria is clearly a humanitarian issue.
Malaria is also an economic issue. Malaria is the single greatest drag on the economy of Africa. Every $1m spent fighting malaria efficiently improves the GDP - the wealth - of the continent of Africa by $12m. Fighting malaria is a very good investment.