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When Malcolm Turnbull deposed Tony Abbott as prime minister, serious action on global warming was hoped for – but almost nothing has changed

Australia’s January news has been full of official reports of record-breaking extreme weather devastating our ecosystems on land and in the sea and government ministers suggesting we build new coal-fired power stations, provide billion-dollar subsidised loans to rail lines for new coal mega-mines, increase coal exports to reduce temperature rises and reduce our ambitions for renewable power.

The disconnect is glaring but perhaps dimmed in the eyes of some readers because Australian politicians have been dissembling on climate change for decades, pretending it will be possible to do what we must without any impact on our position as the world’s largest coal exporter or our domestic reliance on brown coal-fired power, or without incurring any costs.

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How Australia’s widespread adoption of Energy Scores holds important lessons for the U.S. residential housing market.

The Coalition's attack on renewables is being undone by the soaring electricity prices in fossil-fuel dependent Queensland. What is it that the general public appears knows about renewables and electricity prices that so many in the conservative side of politics, including federal energy minister Josh Frydenberg, do not?

The social cost of carbon estimates the damage caused by a tonne of carbon dioxide. Coal image from www.shutterstock.com

One of the key measures President Barack Obama used to develop climate policy could be under threat under President Donald Trump. The “social cost of carbon”, a dollar measure of how much damage is inflicted by a tonne of carbon dioxide, underpins many US and other energy-related regulations (and in the UK too, for example).

The latest estimates from William Nordhaus, one of the best-known economists dealing with climate change issues (together with Nicholas Stern), put the social cost of carbon in 2015 at a baseline of US$31.20. This rises over time as the impacts of climate change worsen.

Conversely, the social cost of carbon is also the “government’s best estimate of how much society gains over the long haul” by reducing CO₂ emissions.

Nordhaus uses an economic model known as the Dynamic Integrated Climate-Economy (or DICE) model, which he developed in the 1990s. I understand it’s one of the leading models for examining the effects of climate change on the economy. Other researchers have adapted and modified DICE to examine issues associated with the economics of climate change.

Social costs of carbon estimates have been – and remain – helpful for assessing the climate impacts of carbon dioxide emission changes, but perhaps not for the incoming Trump administration in the US.

‘More bad news than good news’

First, though, let’s consider the update to Nordhaus’ DICE model. He finds that the results strengthen earlier ones, which indicate “the high likelihood of rapid warming and major damages if policies continue along the unrestrained path” – his view of current policy settings. He revises upwards his estimate of the social cost of carbon by about 50% on the last modelling.

Further, Nordhaus argues that the 2°C “safe” limit set under the Paris Agreement seems to be “infeasible” even with reasonably accessible technologies. This is because of the inertia of the climate system, rapid projected economic growth in the near term, and revisions to the model.

His view is that a 2.5°C limit is “technically feasible” but that “extreme virtually universal global policy measures” would be required. By implication, such measures could refer to geo-engineering and, in particular, removing CO₂ from the atmosphere.

Nordhaus also notes:

Of the six largest countries or regions, only the EU has implemented national climate policies, and the policies of the EU today are very modest. Moreover, from the perspective of political economy in different countries as of December 2016, the prospects of strong policy measures appear to be dimming rather than brightening.

As a result of the DICE modelling, Nordhaus states that there is more bad news than good news and that the need for effective climate change policies is “more and not less pressing”.

His results relate to a world without climate policies, which, as he says, “is reasonably accurate for virtually the entire globe today. The results show rapidly rising accumulation of CO₂, temperatures changes, and damages.”

An end to the use of the social cost of carbon?

As well as the definition earlier of that cost, it could also be described as a government’s best estimate “of how much society gains over the long haul by cutting each tonne” of CO₂ emissions.

While the Obama administration relied on the DICE model (and others) in arriving at a social cost of carbon – such cost is already important in the formation of 79 federal regulations – it appears that the incoming Trump administration might modify or end this use.

It has been argued – by Harvard’s Cass Sunstein and the University of Chicago’s Michael Greenstone – that such action would defy law, science and economics. It is probably unlikely that use of the social cost of carbon would be done away with completely (lowering the operative number might be more likely), although Greenstone and Sunstein do contemplate it.

Sunstein and Greenstone conclude that, without it, federal regulations would have no quantifiable benefits. And that would have implications for emission reductions and assessing progress on dealing with climate change.

And Nordhaus concludes:

The future is highly uncertain for virtually all variables, particularly economic variables such as future emissions, damages, and the social cost of carbon.

That’s definitely the case for climate change policy and action in the US following the election of Donald Trump. For President Trump’s supporters, it appears that “turning back the clock is the most important thing the president-elect can do to help businesses succeed”.

And the president may well do that. He has argued for an increase in coal use and suggested that, under his administration, the US would withdraw from the Paris climate change agreement.

David Hodgkinson does not work for, consult, own shares in or receive funding from any company or organisation that would benefit from this article, and has disclosed no relevant affiliations beyond the academic appointment above.

Not a day goes by that I don’t stand in awe at under-resourced and vulnerable farmers committed to moving mountains despite the odds against them

For those standing on the precipice of life the impacts of climate change are an ever present reality. The rural poor in Southeast Asia are some of the most vulnerable to climate extremes and seasonal vagaries. For these farmers, many who live at subsistence level and survive on less that $1US a day, life is a high-wire act with no safety net.

One stroke of bad luck – a drought, flood or pest outbreak – and they tumble further into hardship. Yet, here in Cambodia I work at an agricultural research centre with the most humbling and inspiring people. Not a day goes by that I don’t stand in awe at an under-resourced team committed to moving mountains despite the odds lined up against them.

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The crack in Antarctica's Larsen C Ice Shelf that looks set to spawn a giant iceberg has spread a further 10km.

Connor speaks to Guardian environment reporter Michael Slezak about the successes and failures of the climate movement, the future of the Paris agreement during a Trump presidency and how Australia can be pushed to take climate change seriously. Connor cautions the environment movement not to walk away from engaging in domestic politics and says informed, engaged citizens can exert a positive influence on the debate

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Dr Anne Hoggett speaks with Guardian Australia environment reporter Michael Slezak about the extensive damage the mass coral bleaching event has wrought on the Great Barrier Reef, as viewed from the Lizard Island Research Station, and says the scale of destruction is by far the ‘worst insult the reef has had’

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David Ritter speaks with Guardian environment reporter Michael Slezak about how the Donald Trump presidency election will impact the future of environment and climate change campaigning in Australia and around the region

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Publicly funded competition had already cost £100m when it was cancelled by the Treasury amid concerns over cost to consumers

A publicly funded scheme to reduce carbon emissions collapsed, after running up costs of £100m, following a disagreement between government departments, Whitehall’s spending watchdog has concluded.

Ministers launched a competition for developing technology to capture carbon emissions before Treasury officials cancelled the project, a report by the National Audit Office has found.

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Old energy rules were all about locking in cheap base-load power, and supplementing it with more expensive capacity, generally gas, to meet the peaks. The new way is about putting in super-cheap, “base-cost” renewable power at the heart of the world’s grids.

Each day glaciologist Jason Roberts flies planes over Antarctica to map the terrain under the ice, trying to discover how climate change will affect sea level rise. Roberts, who works for the Australian Antarctic Division, says the point of his work is to look for the ‘canary in the coalmine’, identifying hotspots where warm water is interacting with the east Antarctic ice shelf, making it vulnerable to changing climate conditions that could have drastic implications

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I’ve maintained a wall between my job and my emotional response to it, but this month I’ve felt dread rising about looming disaster, and it’s an awakening

Until recently, like a sociopath might have little feelings when witnessing violence, I’ve managed to have relatively mild emotional responses to climate change.

For five years I’ve been covering climate change – the science that underpins it, the things that are driving it, the devastation it is wreaking, and the desperate measures we need to urgently put in place to mitigate it. (Not to mention the reporting I’ve done on the pathetic politics surrounding it.)

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Spot electricity prices have gone through the stratosphere this summer, particularly in Queensland where average prices have been more than double of renewable energy leader South Australia.

It feels like every other day there’s at least one new article touting blockchain as “the next big thing in energy.” But the blockchain is a bit of an esoteric concept to most of us. So, what is it?

APX and CBL Markets plan to explore additional environmental market registry connections in 2017.

Kutubdia, an island of fishing villages and salt farms, has halved in size in 20 years, with family homes destroyed by ever-encroaching tides. In nearby Cox’s Bazar, more frequent storms have had a severe impact on fishermen’s catches

All photographs by Noor Alam/Majority World

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Only 17.7% of respondents in polling commissioned by GetUp believe renewable energy is the primary culprit

Australian voters have not been swayed by a campaign attempting to blame rising power prices on renewable energy, according to new polling commissioned by GetUp.

Conservative media, as well as the federal government, have been attacking renewable energy, blaming it for rising power bills as well as blackouts that were caused by extreme weather.

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The Independent Review into the Future Security of the National Electricity Market, chaired by Australia’s Chief Scientist Dr Alan Finkel, is commencing a wide-ranging open public consultation process.

A 47-year-old man was taken after trying to wade across the East Alligator river, Northern Territory police say

A man has been killed by a crocodile at Cahill’s Crossing in Kakadu national park.

Northern Territory police said the 47-year-old man was attempting to wade across the East Alligator river with two women about 4pm on Thursday when he was taken by a 3.5-metre saltwater crocodile. The two women, who made it across the river, did not witness the attack but raised the alarm when they saw he was gone.

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