International efforts to help Haiti are under way, as governments around the world and aid agencies mobilise search and rescue teams and aid supplies.Although the full scale of the disaster has yet to emerge, it is clear that it will pose a huge challenge.
Haiti, the poorest country in the western hemisphere, is still struggling to recover from devastating hurricanes in 2008.
It needs all kinds of help, from emergency and medical aid, to food aid, to the longer-term rebuilding of infrastructure.
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