New Delhi, Oct. 29 -- Most of the world's countries have missed a critical deadline to update their climate promises, leaving international efforts to curb global warming dangerously short of what scientists say is needed to avoid catastrophic consequences, a United Nations analysis released on Tuesday has found. Only 64 of 195 parties to the Paris Agreement have updated their nationally determined contributions (NDCs) - the formal climate commitments that underpin international efforts to limit temperature rise. The shortfall is particularly stark among the world's largest polluters: China and India have yet to formally submit their updates, while doubts loom over whether the US will honour commitments made under the previous administratio...