【正确答案】 1、are likely to accelerate the rate/speed/pace of climate change    

【答案解析】[解析] sth.is(un)likely to...=it is(im)possible for sth.to…=it is(im)possible that...。 [点睛] 此句中“加快……的速度”表达方式较多，还可以译成speed up the rate/pace of climate change,pick up the rate/pace/speed of climate change等。