NASA @NASA
How do tree rings teach us about our changing climate? The rings are thinner in years when it’s dry. Thanks to new @NASAEarth data, we now know that human-generated emissions have been affecting global drought since the early 20th century. Stay informed: https://t.co/zamU25aUzR https://t.co/5VXeaUaxEy — PolitiTweet.org