<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><a href="https://www.ncdc.noaa.gov/temp-and-precip/drought/nadm/maps" class="">https://www.ncdc.noaa.gov/temp-and-precip/drought/nadm/maps</a><div class=""><br class=""></div><div class=""><br class=""><div class="">
<div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div style="color: rgb(0, 0, 0); font-family: Verdana; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~<br class="">A species or ecosystems recovery from disturbances can be reversed, and fail; e.g., “ … recovery rates decrease as a catastrophic regime shift is approached, a phenomenon known in physics as 'critical slowing down.' …. In all the models we analyzed, critical slowing down becomes apparent quite far from a threshold point, suggesting that it may indeed be of practical use as an early warning signal” (van Nes and Scheffer. American Naturalist, 2007).</div></div>
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