- things were beginning to heat up.
局势开始升温 - 200,000 years after the big freeze,
大冰冻的20年之后 - there appeared in the ice a vein of blue.
冰中出现了一条蓝色血管 - Water.
水 - Carbon dioxide levels had bounced back,
二氧化碳水平回升 - causing global temperatures to rise.
导致全球温度上升 - The great melt had begun.
大融化开始