ARLINGTON, Va.--(BUSINESS WIRE)--Insurers across the world say regulatory changes and sustained low interest rates will continue to be their primary environmental challenges over the next one to three years, according to a new insurance industry outlook survey conducted by global professional services company Towers Watson (NYSE, NASDAQ: TW). While these near-term environmental challenges stand as insurers’ top concern (62%), they also express worries about more fundamental issues such as wheth