转篇严肃的科学文章哈，要不这里只剩口水了：

How the World Passed a Carbon Threshold and Why It Matters

 

Yale Environment 360‏

 

The last time the planet had 300-400 ppm of CO2 in the atmosphere, sea levels were at least 15-25 meters higher.

http://e360.yale.edu/features/how-the-world-passed-a-carbon-threshold-400ppm-and-why-it-matters