{"id":10422,"date":"2015-06-17T08:31:56","date_gmt":"2015-06-17T13:31:56","guid":{"rendered":"http:\/\/blogs.edf.org\/climate411\/?p=10422"},"modified":"2015-06-17T08:31:56","modified_gmt":"2015-06-17T13:31:56","slug":"six-climate-tipping-points-how-worried-should-we-be","status":"publish","type":"post","link":"https:\/\/blogs.edf.org\/climate411\/2015\/06\/17\/six-climate-tipping-points-how-worried-should-we-be\/","title":{"rendered":"Six Climate Tipping Points: How Worried Should We Be?"},"content":{"rendered":"<p>One of the biggest fears about <a href=\"http:\/\/www.edf.org\/climate\/climate-facts-dangers-and-what-you-can-do\">climate change<\/a> is that it may be triggering events that would dramatically alter Earth as we know it.<\/p>\n<p>Known to scientists as \u201ctipping events,\u201d they could contribute to mass extinction of species, dramatic sea level rise, extensive droughts and the transformation of forests into vast grasslands \u2013 among other upheavals our stressed world can ill afford.<\/p>\n<p>Here are the top six climate events scientists worry about today.<\/p>\n<p><strong>1. The Arctic sea ice melts<\/strong><\/p>\n<p>The melting of the Arctic summer ice is considered to be the single greatest threat, and some scientists think we\u2019ve already passed the tipping point.<\/p>\n<p>As sea ice melts and the Arctic warms, dark ocean water is exposed that absorbs more sunlight, thus reinforcing the warming. The transition to an ice-free Arctic summer can occur rapidly \u2013 within decades \u2013 and this has geopolitical implications, in addition to a whole ecosystem being disrupted.<\/p>\n<figure style=\"width: 387px\" class=\"wp-caption alignleft\"><img loading=\"lazy\" decoding=\"async\" class=\"imgFlex\" src=\"http:\/\/static.edf.org\/cdn\/farfuture\/sz8CnfUjhIpLPxLw959M8AvMmL02zhGcZvsPGYQ-9wU\/mtime:1432655136\/sites\/default\/files\/polarbear_387x235.jpg\" alt=\"\" width=\"387\" height=\"235\" border=\"0\" \/><figcaption class=\"wp-caption-text\">Photo: Smudge 900)<\/figcaption><\/figure>\n<p><strong>2. Greenland becomes ice-free<\/strong><\/p>\n<p>The warming of the Arctic may also render Greenland largely ice-free. While Greenland\u2019s ice loss will likely reach the point of no return within this century, the full transition will take at least a few hundred years.<\/p>\n<p>The impacts of the Greenland ice melt is expected to raise sea levels by up to 20 feet.<\/p>\n<p>Half of the 10 largest cities in the world, including New York City, and one-third of the world\u2019s 30 largest cities are already threatened by this sea level rise. Today, they are home to nearly 1.8 billion people.<\/p>\n<p>Other vulnerable American cities include Miami, Norfolk and Boston.<\/p>\n<figure style=\"width: 387px\" class=\"wp-caption alignright\"><img loading=\"lazy\" decoding=\"async\" class=\"imgFlex\" src=\"http:\/\/static.edf.org\/cdn\/farfuture\/DSjJ-dtAucp3GkjGNtqMxgkb5ByvhyRsx2OwQU_Y13M\/mtime:1432224213\/sites\/default\/files\/miamiflood_387x235.jpg\" alt=\"\" width=\"387\" height=\"235\" border=\"0\" \/><figcaption class=\"wp-caption-text\">Photo: siralbertus<\/figcaption><\/figure>\n<p><strong>3. The West Antarctic ice sheet disintegrates<\/strong><\/p>\n<p>On the other side of Earth, the West Antarctic ice sheet is also disintegrating. Because the bottom of this glacier is grounded below sea level, it\u2019s vulnerable to rapid break-up, thinning and retreat as warm ocean waters eat away at the ice.<\/p>\n<p>Scientists expect the West Antarctic ice sheet to \u201ctip\u201d this century, and there is evidence that it already began happening in 2014.<\/p>\n<p>However, the entire collapse of the glacier, which would raise sea level by 16 feet, could take a few hundred years.<\/p>\n<figure style=\"width: 387px\" class=\"wp-caption alignleft\"><img loading=\"lazy\" decoding=\"async\" class=\"imgFlex\" src=\"http:\/\/static.edf.org\/cdn\/farfuture\/xAtialo7k45_SGP_HYfr2IIvABqMBBCfFwSXx5Ijjrw\/mtime:1431720332\/sites\/default\/files\/meltingice_387x235.jpg\" alt=\"\" width=\"387\" height=\"259\" border=\"0\" \/><figcaption class=\"wp-caption-text\">Photo: BBC World Service<\/figcaption><\/figure>\n<p><strong>4. El Ni\u00f1o becomes a more permanent\u00a0<\/strong><strong>climate fixture<\/strong><\/p>\n<p>The oceans absorb about 90 percent of the extra heat that is being trapped in the Earth system by greenhouse gases. This could affect the ocean dynamics that control El Ni\u00f1o events.<\/p>\n<p>While there are several theories about what could happen in the future, the most likely consequence of ocean heat uptake is that El Ni\u00f1o, a natural climate phenomenon, could become a more permanent part of our climate system.<\/p>\n<p>That would cause extensive drought conditions in Southeast Asia and elsewhere, while some drought-prone areas such as\u00a0<a href=\"http:\/\/www.edf.org\/blog\/2014\/10\/02\/how-scientists-linked-california-drought-climate-change\">California<\/a> would get relief.<\/p>\n<p>The transition is expected to be gradual and take around a century to occur \u2013 but it could also be triggered sooner.<\/p>\n<figure style=\"width: 387px\" class=\"wp-caption alignright\"><img loading=\"lazy\" decoding=\"async\" class=\"imgFlex\" src=\"http:\/\/static.edf.org\/cdn\/farfuture\/1j1mfEIdhR6j5OLmLVX-jt7by1HQMfYhGTcSpGa22l0\/mtime:1431720940\/sites\/default\/files\/indiadrought_387x235.jpg\" alt=\"\" width=\"387\" height=\"235\" border=\"0\" \/><figcaption class=\"wp-caption-text\">Photo: Austin Yoder<\/figcaption><\/figure>\n<div class=\"captionImg\"><\/div>\n<div class=\"captionText\">\u00a0<strong>5. The Amazon rain forest dies back<\/strong><\/div>\n<p>Rainfall in the Amazon is threatened by <a href=\"http:\/\/www.edf.org\/blog\/2013\/11\/14\/tragedy-and-transformation-deforestation-amazon\">deforestation<\/a>, a longer dry season, and rising summer temperatures.<\/p>\n<p>At least half of the Amazon rainforest could turn into savannah and grassland, which &#8211; once triggered &#8211; could happen over just a few decades. This would make it very difficult for the rainforest to reestablish itself and lead to a considerable loss in biodiversity.<\/p>\n<p>However, the reduction of the Amazon ultimately depends on what happens with El Ni\u00f1o, along with future land-use changes from human activities.<\/p>\n<figure style=\"width: 387px\" class=\"wp-caption alignleft\"><img loading=\"lazy\" decoding=\"async\" class=\"imgFlex\" src=\"http:\/\/static.edf.org\/cdn\/farfuture\/SNxcgzHoh0g3DSRFdHPTwqRB8XjbnAcNiRggHePicug\/mtime:1431723466\/sites\/default\/files\/amazon_387x235_farmer.jpg\" alt=\"\" width=\"387\" height=\"235\" border=\"0\" \/><figcaption class=\"wp-caption-text\">Photo: World Bank<\/figcaption><\/figure>\n<div class=\"captionImg\"><\/div>\n<div class=\"captionText\">\u00a0<strong>6. Boreal forests are cut in half<\/strong><\/div>\n<p>Increased water and heat stress are taking a toll on the large forests in Canada, Russia and other parts of the uppermost Northern Hemisphere. So are forest disease and fires.<\/p>\n<p>This could lead to a 50-percent reduction of the boreal forests, and mean they may never be able to recover. Instead, the forest would gradually transition into open woodlands or grasslands over several decades.<\/p>\n<p>This would have a huge impact on the world\u2019s carbon balance because forests can absorb much more carbon than grasslands do. As the forest diminishes, the climate will be affected as will the Earth\u2019s energy balance.<\/p>\n<p>However, the complex interaction between tree physiology, permafrost and fires makes the situation tricky to understand.<\/p>\n<figure style=\"width: 387px\" class=\"wp-caption alignright\"><img loading=\"lazy\" decoding=\"async\" class=\"imgFlex\" src=\"http:\/\/static.edf.org\/cdn\/farfuture\/7fxR6-5II5pMIgFUBBlU4aqr02I6mYCPpNiaR6fXahE\/mtime:1432656991\/sites\/default\/files\/moose_387x235.jpg\" alt=\"\" width=\"387\" height=\"235\" border=\"0\" \/><figcaption class=\"wp-caption-text\">Photo: Gord McKenna<\/figcaption><\/figure>\n<p><strong>Other concerns\u2026<\/strong><\/p>\n<p>As if that\u2019s not enough, there are a few other tipping events that scientists are also concerned about, but they are even more complex and harder to predict. Examples of such events include\u00a0the greening of the Sahara and Sahel, the development of an Arctic ozone hole and a chaotic Indian summer monsoon.<\/p>\n<p><strong>How do we keep from tipping over?<\/strong><\/p>\n<p>We know from measurements that the Earth has had many climate-related tipping events throughout its history. Today\u2019s situation is different, because <a href=\"http:\/\/www.edf.org\/climate\/human-activity-is-causing-global-warming\">humans are now driving<\/a> these changes and the warming is occurring at a faster rate.<a id=\"_anchor_13\" href=\"\/Users\/krives\/Desktop\/IlissaTippingPoints_051315_revised.docx#_msocom_13\" name=\"_msoanchor_13\"><br \/>\n<\/a><\/p>\n<p>But as humans we also have the power to change the trajectory we\u2019re on \u2013 possibly in a matter of a few years. We think we know how.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>One of the biggest fears about climate change is that it may be triggering events that would dramatically alter Earth as we know it. Known to scientists as \u201ctipping events,\u201d they could contribute to mass extinction of species, dramatic sea level rise, extensive droughts and the transformation of forests into vast grasslands \u2013 among other &#8230;<\/p>\n","protected":false},"author":40054,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[100,95,52,202,38,101],"tags":[],"coauthors":[],"class_list":["post-10422","post","type-post","status-publish","format-standard","hentry","category-arctic-antarctic","category-basic-science-of-global-warming","category-extreme-weather","category-greenhouse-gas-emissions","category-oceans","category-plants-animals"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Six Climate Tipping Points: How Worried Should We Be? - Climate 411<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blogs.edf.org\/climate411\/2015\/06\/17\/six-climate-tipping-points-how-worried-should-we-be\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Six Climate Tipping Points: How Worried Should We Be? - Climate 411\" \/>\n<meta property=\"og:description\" content=\"One of the biggest fears about climate change is that it may be triggering events that would dramatically alter Earth as we know it. Known to scientists as \u201ctipping events,\u201d they could contribute to mass extinction of species, dramatic sea level rise, extensive droughts and the transformation of forests into vast grasslands \u2013 among other ...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/blogs.edf.org\/climate411\/2015\/06\/17\/six-climate-tipping-points-how-worried-should-we-be\/\" \/>\n<meta property=\"og:site_name\" content=\"Climate 411\" \/>\n<meta property=\"article:published_time\" content=\"2015-06-17T13:31:56+00:00\" \/>\n<meta property=\"og:image\" content=\"http:\/\/static.edf.org\/cdn\/farfuture\/sz8CnfUjhIpLPxLw959M8AvMmL02zhGcZvsPGYQ-9wU\/mtime:1432655136\/sites\/default\/files\/polarbear_387x235.jpg\" \/>\n<meta name=\"author\" content=\"Ilissa Ocko\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@ilissaocko\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Ilissa Ocko\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/blogs.edf.org\\\/climate411\\\/2015\\\/06\\\/17\\\/six-climate-tipping-points-how-worried-should-we-be\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/blogs.edf.org\\\/climate411\\\/2015\\\/06\\\/17\\\/six-climate-tipping-points-how-worried-should-we-be\\\/\"},\"author\":{\"name\":\"Ilissa Ocko\",\"@id\":\"https:\\\/\\\/blogs.edf.org\\\/climate411\\\/#\\\/schema\\\/person\\\/0157686ede269eea903c874a6ea5cf1f\"},\"headline\":\"Six Climate Tipping Points: How Worried Should We Be?\",\"datePublished\":\"2015-06-17T13:31:56+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/blogs.edf.org\\\/climate411\\\/2015\\\/06\\\/17\\\/six-climate-tipping-points-how-worried-should-we-be\\\/\"},\"wordCount\":868,\"commentCount\":1,\"image\":{\"@id\":\"https:\\\/\\\/blogs.edf.org\\\/climate411\\\/2015\\\/06\\\/17\\\/six-climate-tipping-points-how-worried-should-we-be\\\/#primaryimage\"},\"thumbnailUrl\":\"http:\\\/\\\/static.edf.org\\\/cdn\\\/farfuture\\\/sz8CnfUjhIpLPxLw959M8AvMmL02zhGcZvsPGYQ-9wU\\\/mtime:1432655136\\\/sites\\\/default\\\/files\\\/polarbear_387x235.jpg\",\"articleSection\":[\"Arctic &amp; Antarctic\",\"Basic Science of Global Warming\",\"Extreme Weather\",\"Greenhouse Gas Emissions\",\"Oceans\",\"Plants &amp; Animals\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/blogs.edf.org\\\/climate411\\\/2015\\\/06\\\/17\\\/six-climate-tipping-points-how-worried-should-we-be\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/blogs.edf.org\\\/climate411\\\/2015\\\/06\\\/17\\\/six-climate-tipping-points-how-worried-should-we-be\\\/\",\"url\":\"https:\\\/\\\/blogs.edf.org\\\/climate411\\\/2015\\\/06\\\/17\\\/six-climate-tipping-points-how-worried-should-we-be\\\/\",\"name\":\"Six Climate Tipping Points: How Worried Should We Be? 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