Luo says there were 72 people per square kilometer in his native district near the Russian border.

FORBES: Issues & Ideas

Southern Khabarovsk has the same climate as Heilongjiang but only 1.2 people per square kilometer, meaning the region could support tens of millions--if not more--of Chinese, he argues.

FORBES: Issues & Ideas

Total carbon deposits per square kilometer in these coastal systems may be up to five times the carbon stored in tropical forests, due to their ability to absorb, or sequester, carbon at rates up to 50 times those of the same area of tropical forest.

UNESCO: Biodiversity Initiative