13/10/2018

Climate Change Will Make The Next Global Crash The Worst

The Guardian

The storm clouds are gathering, but the world’s economies now have far fewer shelters from disaster than they did in 1929
 Illustration: Eva Bee
Late last month Indonesia was hit by a devastating earthquake and tsunami that left thousands of people dead and missing. This week the International Monetary Fund arrived in the country to hold its annual meeting on the island of Bali.
On the day when the IMF issued a warning about trouble ahead for the global economy, the latest report from the UN’s intergovernmental panel on climate change said the world had only a dozen years left to take the steps necessary to prevent a global warming catastrophe.
The message is clear for those willing to hear it: get ready for a time when economic failure combines with ecological breakdown to create the perfect storm.
Even without the added complication of climate change, the challenge facing the finance ministers and central bank governors gathered in Bali would be significant enough. The IMF has cut its forecast for global growth, but the chances are that next year will be a lot worse than is currently forecast. The risks, the IMF says, are skewed to the downside. You bet they are.
Here’s a brief checklist. For the past 10 years, the world economy has been surviving on a diet of low interest rates and money creation by central banks, but that stimulus is now being gradually withdrawn. In the United States, growth has been further pumped up by Donald Trump’s tax cuts for individuals and companies, but only temporarily. The impact will start to fade next year as higher interest rates start to bite. Trump is already berating the Federal Reserve, America’s central bank, for increasing borrowing costs.
In Europe, a colossal row is brewing between Italy’s populist government and the fiscal conservatives at the European commission because the budget proposed by Rome runs completely counter to the EU’s fiscal rules. Officials in Brussels are more worried about Italy than they are about Brexit, and with good reason. Italy’s banks are awash with bad debts and could not survive the sort of financial crisis that appears to be in prospect. It is a much bigger country than Greece, and far too big for Europe to bail out if the worst happens.
The standoff between Rome and Brussels is happening as Europe’s growth rate has started to slow. One reason is that its export-driven economies are already being hurt by the early skirmishes in Trump’s trade war. As the IMF noted this week, protectionism is a key risk to global growth.
China, the world’s second biggest economy, has always been Trump’s main target, and it has been affected by new US tariffs, as its domestic economy was already slowing. Elsewhere, in the past few months the IMF has been called in to help Argentina, there has been a run on the Turkish lira, and inflation in Venezuela threatens to hit Weimar Germany-style levels.
In better times, oil-rich Venezuela might have been well placed to benefit from the rising price of crude oil, which is heading steadily towards $100 a barrel. Every big recession in the global economy has been prefigured by a jump in the cost of crude, which makes it somewhat curious that share prices on Wall Street are so high. Traditionally, stock markets anticipate trouble, but the mood currently is to dismiss higher interest rates, rising oil prices, Italy and trade wars as somehow unimportant.
Ominously, next year is the 90th anniversary of the Wall Street Crash. The Great Depression that followed that market meltdown led to new economic thinking. It spawned full employment policies, increased spending on welfare, and a new set of multilateral organisations.
Turn the clock forward to 2018 and the parallels are obvious. International cooperation has broken down, economic failure has damaged mainstream political parties, and belief in the invisible hand of the free market has been shattered. But the threat posed by global warming means the current crisis of capitalism is more acute than that of the 1930s, because all that was really required then was a boost to growth, provided by the New Deal, cheap money, tougher controls on finance and rearmament. In today’s context, a plain vanilla go-for-growth strategy would be suicidal.
Even so, there are countries that are prepared to self-immolate their economies in pursuit of growth at all costs. America is one. Australia appears to be another. At the other end of the spectrum are those who say there will be a future for the planet only if the idea of growth is ditched altogether. Politically, this has always been a hard sell, and has become even more difficult now that populations in the west have experienced an entire decade of flatlining living standards.
In the developing world, the problem has been too little growth rather than too much. Tackling global population growth is a no-brainer from a climate-change perspective, and most of the projected increase comes from low-income countries, most notably in Africa. The reason is simple: poor families have more children. Birthrates fall as countries become richer.
Between the two extremes are those who think the circle can be squared by carbon-free growth, made possible by the dramatic fall in the cost of renewable energy. Technology will ride to the rescue, they insist.
This sounds like a cost-free (or at least relatively cheap) option, and that’s why almost all politicians pay lip service to green growth. But then they act in ways that make achieving global warming targets harder – by building new roads and expanding airports. And always for the same reason: because doing so will be good for growth. This is called a balanced approach, but it is nothing of the sort. If the IPCC is even close to being right about its timeline, speeding up the transition from fossil fuels to renewables is vital.
Can that be done? One of the winners of this year’s Nobel prize for economics – William Nordhaus – says it can, if policymakers get serious about a carbon tax set high enough to price oil, coal and gas out of the market.
Here, though, the breakdown in international cooperation and trust becomes really damaging. Ideally, existing global institutions – the IMF, the World Bank, the UN and the World Trade Organization – would be supplemented by a new World Environmental Organisation with the power to levy a carbon tax globally. Even in the absence of a new body, they would be working together to face down the inevitable opposition to change from the fossil fuel lobby.
Instead, the response to climate change looks similar to the response to the financial crisis: fail to recognise there is a problem until it is too late; panic; then muddle through. That’s a sobering prospect.

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States' Climate Risks Are Rising, Led By Health Impacts: Moody's

FairfaxPeter Hannam

Australia's states face increasing threats from climate change but their economic diversity will be key to providing a buffer against the worst of the economic fallout, according to international ratings agency Moody's.
The main risks include rising sea levels, more intense storms and heatwaves that are expected to take their toll on the finances of state treasuries, the agency said in a new report.
Climate change costs are going to mount for Australia's states, Moody's says. Credit: Dean Lewins
The Moody's report, the agency's first to examine the financial health of the states and territories, comes a day after the Intergovernmental Panel on Climate Change released its special report into the international effects if global warming is allowed to exceed 1.5 degrees.
"From what we can see now, the capital spending required looks manageable across all the states," John Manning, a senior credit officer with Moody's, said. “There’s no immediate impact on states and territory ratings.” The agency has a AAA rating, its highest level, for federal government debt.
The challenges are expected to mount both at the federal level, but particularly at the level of state and local government. "That's where the primary responsibility for preventing, preparing and responding to national disasters actually sit," Mr Manning said.
Increasing temperatures and the related effects on heatwaves and more extreme fire weather are likely to lead the challenges facing states given the possible health risks. Health spending typically amounts to about 30 per cent of state budgets, he said.
The cost of extreme weather could also hinge on the intensity of short-term cycles such as El Ninos, which can exacerbate dry spells over southern and eastern Australia. The Bureau of Meteorology on Tuesday raised its outlook to "alert", rating the chances of an El Nino at 70 per cent, or triple the normal level.
States' infrastructure spending will also likely increase to cope with rising sea levels and more intense storms. Cyclones tracking further south will also challenge regions where building codes have been less stringent, Mr Manning said.
The IPCC reports have shown agriculture-based economies were likely to be the most vulnerable to the more chaotic weather expected as the planet warms.
The atmosphere can hold about 7 per cent more moisture with degree of warming – and that's about the level since the industrial era began – while droughts are made worse by increased evaporation amid the warmer temperatures.
For Australia, the diversity of the economies even with states will shield the economy from some of the worst disruptions, Moody's predicts.
For instance, mining accounts for just 3.2 per cent of NSW's gross value added economy, the agency said, and just 0.9 per cent in Victoria.
Queensland, though, has more of a concentration, with mining accounting for almost 10 per cent of the economy and tourism 7.5 per cent.
Mining accounts for about 30 per cent of Western Australia's economy but is more iron-ore based than mining in the eastern states and so less exposed to the expected trend away from coal envisaged by the IPCC, Mr Manning said.
Still, changing weather, warming oceans and shifting ecosystems may force changes in Tasmania, where just over a 10th of the economy is derived by agriculture, forestry and fishing, easily the most of any state.
Just as the spread of industries gives Moody's comfort in the ratings outlook for the states, it also implies that adjustments – such as reduced coal mining – can be navigated by state governments if they are nimble enough.
“These challenges also open up opportunities for new industries and new growth,” Mr Manning said.

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What The Past Can Tell Us About The Future Of Climate Change

University of Melbourne - Associate Professor Russell Drysdale

For several millennia during the Last Interglacial period, temperatures were higher than pre-industrial levels and that had an impact on our climate system. But with recent dire forecasts of global warming, what can the past tell us about the future of our climate?
Getty Images
Earlier this week, 91 of the best scientific minds from around the globe warned what the world could look like if we fail to keep global warming below 1.5℃ this century.
The report by the UN Intergovernmental Panel on Climate Change (IPCC) says heat, droughts and flooding will become more common and extreme. It also warned of the impact on the Arctic, which is warming twice as fast as the average rise of the rest of the planet.
The Greenland ice sheet covers almost two million square kilometres of the country.
Picture: Wikimedia
And this means the faster melting of the Greenland ice sheet. This ice sheet is important. It’s the second largest body of ice in the world, covering almost two million square kilometres or roughly 80 per cent of the surface of Greenland.
In recent years, the ice sheet has seen record levels of melting - with the ‘melt zone’, where snow and ice turns into slush and meltwater, expanding at an accelerating rate.
In fact, recent climate modelling and observational data suggests that the magnitude of surface ‘freshening’ in the sub-polar region of the North Atlantic could be enough to significantly disrupt ocean circulation. This would have trickle-down effects on the climate that could lead to widespread changes in rainfall as far away as the southern hemisphere tropics.
In other words, to us here in Australia.
But history can also help give us a ‘bigger picture’ look at what might happen in the future for the ice sheet.

Warming Up
We can look back at warmer periods from the past, like the Last Interglacial, which occurred between about 129,000 and 116,000 years ago, in order to understand the relationship between global warming, ice-sheet melting and how our climate system responds.
Parts of the Last Interglacial were actually warmer than the current Holocene Interglacial (the last 11,700 years), particularly in the Arctic region.
As a result, sea levels then were higher than they are now – the latest estimates suggest somewhere between 6 and 9 metres above today’s level. And between 0.6 and 3.5 metres of this sea level was contributed from melting of the Greenland ice sheet, which was smaller than it is today because of strong Arctic warming at the time.
Changes in rainfall is registered in stalagmites’ geochemistry.
Picture: Supplied
It’s worth noting, though, that these warmer Last Interglacial temperatures were naturally occurring – a result of changes in Earth’s orbit at the time. But in these post-Industrial days, it’s human-induced warming that’s heating up our planet.
So, what effect did this meltwater from Greenland have on ocean circulation and regional climate?
Our international team of scientists, led by Professor Chronis Tzedakis from the University College London, set out to answer this question. The team studied ocean sediments from a drill core taken just off the coast of Lisbon in Portugal, as well as stalagmites collected from an Italian cave system.
This information was then compared with other ocean cores and climate-model simulations to explore the links between the ice-sheet melting, change to the North Atlantic Ocean circulation and climate change across southern Europe.
The ocean sediments we collected not only contained essential information about past sea-surface-temperature and ocean-current changes in the North Atlantic during the Last Interglacial, but also preserved plant microfossils (pollen) from rivers draining the Portuguese hinterland.
Because these two sets of information come from exactly the same sedimentary archive, this enabled us to match regional vegetation changes with the shifts in ocean-circulation patterns in the North Atlantic.
At this time, stalagmites were slowly growing almost 2000 kilometres away in Antro del Corchia, a 60 kilometre-long cave system in northern Italy. The drip waters that build-up these formations originate from rain falling above the cave – and this rain mainly comes from air masses crossing the North Atlantic.
Periods of ‘excess warmth’, like the Last Interglacial, can lead to significant melting of ice in Greenland.
Picture: NASA
So any changes in climate and ocean currents in the North Atlantic affect the amount of rainfall reaching Corchia cave and this information is registered in the stalagmites’ geochemistry.
By comparing the information contained in the marine sediments and stalagmites we found a consistent pattern of climate fluctuations throughout the Last Interglacial. The interval of warm, wet climate that occurred at the very start of the interglacial, spanning about 2500 years, came to an abrupt end around 126,500 years ago when the abundance of drought-sensitive trees plummeted.
The same trend was revealed in the stalagmite geochemistry. In fact there was such an obvious reduction in rainfall that one stalagmite actually stopped growing. Several other smaller changes are seen in both the ocean-sediment and stalagmite records as the Last Interglacial progressed.
So what caused these rainfall changes?

Changing Weather
A comparison of our data with previously published ocean-sediment studies shows that most of the aridity events, or the drying out of the climate, across southern Europe can be can correlated to cooling phases in the sub-polar North Atlantic.
These phases are inferred from changes in the abundance and geochemistry of marine microfossils at these more northerly ocean sites.
While cooling may sound counter-intuitive, its effects aren’t. Ocean currents in the North Atlantic bring warm water from the tropics north to higher latitudes, keeping western Europe relatively warm. This current is actually a part of a larger circulation that links to the global ocean system called the Atlantic Meridional Overturning Circulation, or the AMOC.
AMOC is a large system of ocean currents that carry warm water
from the tropics northwards into the Arctic region.
Picture: Wikimedia
 But any disturbance of the AMOC can have an impact. One way that can happen is meltwater from an ice sheet - a tongue of cold, fresh water that is less dense than the salty water coming up from the tropics.
Because of the intertwined relationship between ocean temperature and our atmosphere, this ocean cooling causes a southward shift in the Arctic front, changing moisture transport and air mass trajectories across Europe. In Southern Europe this can mean less rain - less evaporation from cooler ocean surfaces, so less moisture in the atmosphere to bring rain.
The major cooling 126,500 years ago has been attributed largely to the final melting of the remnants of a large ice sheet that covered northern USA and Canada during the preceding glacial period.
The meltwater from this ice sheet travelled through Hudson Bay and out into the North Atlantic via the Labrador Sea, and may also have involved melting ice from Greenland. The meltwaters caused regional cooling and interrupted ocean circulation.
Data from the sub-polar ocean cores also suggest that the subsequent aridity events in southern Europe could also have been triggered by melting ice from Greenland.
To test this scenario, our colleagues Dr Laurie Menviel and Dr Andrea Taschetto from the University of New South Wales, worked on modelling experiments.

Century-Scale Disruptions
These experiments simulated meltwater flowing into the sub-Arctic region using the same volume of water Greenland’s ice released that affected sea levels during the Last Interglacial and at rates comparable to today’s sea level increases (a few millimetres each year).
The results indicate that the volume of meltwater would have weakened ocean circulation in the North Atlantic by 35 per cent for the largest event and 20 per cent for the smaller ones - in both cases leading to rainfall decreases across the Mediterranean that lasted a few centuries.
We can see this reflected in the vegetation and rainfall changes suggested by the ocean-core and stalagmite data.
Could the Greenland ice sheet melt faster than in the past?
Picture: Shutterstock
The results of this work suggest that periods of ‘excess warmth’, like the Last Interglacial, can lead to significant melting of ice in Greenland and century-scale disruptions in the North Atlantic Ocean circulation that have an effect on rainfall much further afield.
Whether or not this occurred during older interglacials, and precisely how these events influenced the climate of regions beyond southern Europe, are the subject of ongoing studies.
But with mean global temperatures creeping higher, and climate projections showing significant Arctic warming by the year 2100 – comparable to Arctic temperature estimates of the Last Interglacial – the possibility of accelerated Greenland melting looms.
A dry southern Europe is already vulnerable when it comes to water security under climate projections, and although the changes we studied occurred over centuries, were they to play out in the future, it would be a major ongoing issue for us all.

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