Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Cumulative annual net ecosystem productivity (NEP) at the a 80-year-old, b 45-year-old, and c 17-year-old forests. Dry years are shown as yellow (2007, 2017), hot year as burgundy (2018), and concurrent hot and dry years as red (2005, 2010, 2012 and 2016) shades of coloured lines
