TAIPEI, April 15 (Reuters) - War over Taiwan would bring about a "global catastrophe" that China would find it hard to bear, the presidential candidate for Taiwan's ruling Democratic Progressive Party (DPP), William Lai, said on Saturday. "China should clearly realise that once war is launched on Taiwan, Taiwan will admittedly be directly harmed but it will also cause a global catastrophe China will find it hard to bear," Lai said, according to comments provided by the DPP. Both she and Lai say that only Taiwan's people can decide the island's future