A humanitarian catastrophe of terrifying proportions is unfolding in Pakistan, with a fifth of the country under water, and millions of people homeless and desperately needing assistance.

Some relief efforts are underway, but the international response to the mega-disaster has been irresponsibly slow and weak -- the UN has urgently appealed for $460 million of vital aid, but just 60% has been committed.

Relief workers warn that without an immediate increase in aid the death toll could sky-rocket. We can help by pressing our governments to step up their efforts. Let's show our leaders what generosity looks like, and demand that they join us. Use the form below to send a message to key donor governments -- you can either send the pre-written one, or write your own version.

UPDATE: The public outcry is working, with donors now delivering 60% of the UN's funding request (download report here). But the situation on the ground is worsening and aid efforts still too weak -- let's keep the pressure up!