构建文明，理性，睿智的海外华人社区https://usmitbbs.com/
https://usmitbbs.com/viewtopic.php?t=30815
In the 1930s, America planted 220 million trees across Dust Bowl farmland; decades later, thousands of km of shelterbelts still protected farms and wildlife。
美国曾经还是很投入的。