Australia must drastically increase its emissions reduction target to 40% by 2020 to avoid “almost unimaginable social, economic and ecological consequences” from climate change, a new book penned by leading scientists and economists, including Ross Garnaut, has warned. The book, Four Degrees of Global Warming: Australia in a Hot World, sets out a series of stark scenarios facing the country should global temperatures rise by 4C above the pre-industrial average.
Humankind’s greatest crisis coincides with the rise of an ideology that makes it impossible to address. By the late 1980s, when it became clear that manmade climate change endangered the living planet and its people, the world was in the grip of an extreme political doctrine, whose tenets forbid the kind of intervention required to arrest it. Neoliberalism, also known as market fundamentalism or laissez-faire economics, purports to liberate the market from political interference.
Ever since the 2009 climate talks in Copenhagen, world leaders have agreed on 2 degrees Celsius (3.6 degrees F) as the maximum acceptable global warming above preindustrial levels to avert the worst impacts of climate change (today we're at about 0.8 degrees C). But a new study, led by climatologist James Hansen of Columbia University, argues that pollution plans aimed at that target would still result in "disastrous consequences," from rampant sea level rise to widespread extinction.
Hang on. Get Ready. Those are at least two of the takeaways from a new report released by scientists in the National Academy of Sciences on Tuesday which says the sudden impacts of climate change this century and beyond are inevitable but warn that far too little has been done to prepare for them. "If you think about gradual change, you can see where the road is and where you're going. With abrupt changes and effects, the road suddenly drops out from under you." –Prof. Tony Barnosky.
Both abrupt changes in the physical climate system and steady changes in climate that can trigger abrupt changes in other physical, biological, and human systems present possible threats to nature and society. Abrupt change is already underway in some systems, and large scientific uncertainties about the likelihood of other abrupt changes highlight the need for further research. However, with recent advances in understanding of the climate system, some potential abrupt changes once thought to be imminent threats are now considered unlikely to occur this century.
Governments have set the wrong target to limit climate change. The goal at present – to limit global warming to a maximum of 2°C higher than the average for most of human history – “would have consequences that can be described as disastrous”, say 18 scientists in a review paper in the journal PLOS One. With a 2°C increase, “sea level rise of several meters could be expected,” they say. Increased climate extremes, already apparent at 0.8°C warming, would be more severe.
If you’re already in your mid-50s or later, and you’re lucky enough not to reside in any areas that are traditionally prone to hurricanes or flooding, you’ll miss the worst of our imminent destruction. But for those of us who are younger residents of this fragile orb, who hope to live long, healthy, happy lives — well, tough shit.
We’ve clearly triggered the types of positive feedbacks the United Nations warned about in 1990...The world is probably at the start of a runaway Greenhouse Event which will end most human life on Earth before 2040.” He considers only atmospheric carbon dioxide concentration, not the many self-reinforcing feedback loops described below...more
This article a few months old, but very good and alarming. American actress Lily Tomlin is credited with the expression, “No matter how cynical you become, it’s never enough to keep up.” With respect to climate science, my own efforts to stay abreast are blown away every week by new data, models, and assessments. It seems no matter how dire the situation becomes, it only gets worse when I check the latest reports.
