Back-of-the-envelope calculations suggest the cost of coping with climate change is in the tens of billions a year for poor countries (see table).
初略计算(1)穷国一年用于应对气候变化的成本达几百亿(如图所示)。
2
But when you need to switch from one operating system to another-be it because of a changein business direction, technology enhancements, or cost savings-making the switch can be tough.