By Divya Chowdhury and Anisha Sircar DAVOS, Switzerland (Reuters) – Global executives are increasingly worried about the long term viability of their businesses, a PricewaterhouseCoopers pre-Davos survey showed, with pressures mounting from generative artificial intelligence (AI) and climate disruption. Some 45% of more than 4,700 global CEOs surveyed do not believe their businesses will survive, barring significant changes, in the next ten years, the “Big Four” auditor said. “There’s the 55% who think they don’t have to change radically, and I would argue that’s a little naive because the wor…