Reasons include the relatively low death toll of 1,500, the slow onset of the flooding compared with more immediate and dramatic earthquakes or tsunamis, and a global "donor fatigue"—or at least a Pakistan fatigue.
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Fatigue notwithstanding, according to the United Nations, these floods have affected more people than the 2004 Indian Ocean tsunami, the 2005 Kashmir earthquake, and the 2010 Haiti earthquake combined. So far the international community has donated $150 million (response to the Haiti earthquake, for reference, resulted in nearly $1 billion after only 12 days). U.N. officials estimate $460 million is needed immediately——and more rain is on the way.
If you want to make a donation, Pakistani Perspective suggests this list of organizations.
Photo (cc) by Flickr user DVIDSHUB
Via Crooks and Liars