<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><a href="https://thetyee.ca/Opinion/2017/09/22/Summer-With-World-Flames/" class="">https://thetyee.ca/Opinion/2017/09/22/Summer-With-World-Flames/</a><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">
<div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-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=""><br class="">“The idea that mass extinction results from catastrophic environmental change was largely developed more than two centuries ago by Cuvier (17). <br class="">But what defines such an environmental catastrophe? Newell (18) implicitly provides a practical definition: “Extinction... is not simply a result of <br class="">environmental change but is also a consequence of failure of the evolutionary process to keep pace with changing conditions in the physical and <br class="">biological environment” (18). In other words, catastrophe results when the rate of environmental change exceeds a threshold.”<br class=""><br class="">Daniel H. Rothman. Thresholds of catastrophe in the Earth system. <br class="">Science Advances. 20 September 2017 <br class=""><a href="http://advances.sciencemag.org/content/3/9/e1700906/tab-pdf" class="">http://advances.sciencemag.org/content/3/9/e1700906/tab-pdf</a></div></div>
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