Ecologists predict a doomsday scenario (= a time when death and destruction will happen) if global warming continues to increase at the present rate.生态学家预言,如果全球气候变暖继续以目前的速度发展下去,那么世界末日就要来临。
You could talk till/until doomsday (= for a very long time), but they will never change their minds.你可以说个没完没了,但他们决不会改变主意的。