1) Agricultural expansion, logging, and climate variability such as drought are disturbing the Amazon basin. Recent extreme droughts have led to higher tree mortality rates and loss of forest carbon storage.
2) Deforestation reduces evapotranspiration from forests and alters regional climate patterns, lengthening dry seasons and increasing flooding. As deforestation and drought interact, forests become more vulnerable to degradation.
3) While the Amazon forest has resisted moderate annual droughts by accessing deep soil water, extreme multi-year droughts can overwhelm this resilience, as seen in severe droughts in 2005 and 2010 that caused higher tree mortality across the basin.