On Friday November 12, after a wait of a fortnight, the government released a 100-page summary of the modelling and analysis behind its claim that an emissions target of net-zero by 2050 would leave the economy no worse off.
The report details both formal in-house modelling using a large global economic model and a relatively informal but detailed assessment of employment outcomes prepared by the consultancy McKinsey & Company.
The formal modelling starts with a scenario labelled “no Australian action”, in which every developed country other than Australia cuts its emissions to net-zero by 2050, and when taken together every country other than Australia does whatever else is needed to hold global warming to 2°C.
In “no Australian action” Australia as good as ignores the major green technological advances in the rest of the world (including those in hydrogen) and is penalised for not targeting net-zero via measures including carbon tariffs and a reluctance of financiers to advance money to Australian projects.
The modelling compares “no Australian action” with a number of alternative “action” scenarios, of which “the plan” is the most preferred.
Included in “the plan” are the technological advances foregone in “no Australian action” and excluded are the financial penalties.
Under “the plan”, Australia’s gross emissions fall to between 25% and 35% of their 2005 level by 2050. As yet unknown technological advances remove a further 15%, and the rest of the path to net zero is provided by the purchase of emissions offsets, the foreign ones costing (a remarkably cheap) A$40 per tonne.
Given the technological advances and freedom from penalties associated with the plan, it isn’t surprising that it produces a better economic outcome.
What is surprising, given those assumptions, is that the gain in real income the modellers came up with is so small.
Six months difference after 30 years
The projected gain under “the plan” compared with “no Australian action” is 1.6% after 30 years, which is about six months worth of economic growth, meaning the economy would be as big in June 2050 as it would have been in December 2050.
The summary says the employment outcomes produced by McKinsey are “broadly in line” with the outcomes produced by the macroeconomic modelling.
What this means isn’t quite explained. It might have just turned out that way, or the government might have picked or asked for results that mirrored its own.
Regardless, the summary released on Friday has little to say (except in a cursory way) about the impacts of the plan on regions, on industries other than the most emission-intensive, and on the labour market adjustments and changes to the skills and types of education that will be required.
As it happened, the day before the summary was released, my team at the Centre of Policy Studies at Victoria University published its own modelling of the economic impact on Australia of achieving net-zero emissions with a good deal more detail about the impacts on regions and industries.
We are preparing a second report on the impact on education with the Mitchell Institute for release early next year.
We asked a slightly different question…
My team assessed the impacts of net-zero in a slightly different way to the government, by asking what would happen to the Australian economy if the rest of the world (including Australia) moved to net-zero by 2050, comparing it to what would happen if they did not.
In our modelling Australia faced no financial penalty for not pulling its weight and there was no role for as yet unknown technologies and no ability for Australia to achieve net-zero by buying permits from overseas. This made our modelling conservative, less likely to find that net-zero produced an economic benefit.
…and got a similar answer
We found that despite deep cuts in emissions, the Australian economy would continue to grow strongly in terms of production and employment. However after 30 years real GDP and income would be slightly lower than they would have been without action.
In contrast to the government’s projected gain of around 1.6% after 30 years (six months of economic growth) we found a loss of around 1%, equivalent to four to five months of economic growth.
Real GDP in 2021 prices, base case and net-zero scenarios
What’s significant is that when we last did this work in 2014, we estimated a larger loss in GDP of 3.8%.
The loss is smaller now because the task has become easier, thanks to lower than previously expected renewable generation costs and a faster than expected uptake of both light and heavy electric vehicles.
On employment, we found Australia would have about the same number of jobs by 2050 under either scenario.
Industries such as coal mining would suffer, although not as much as might be thought. Coal mining would continue in 2050 due to continued international demand, with production down 34% and hours worked down 37% compared to no more toward net-zero.
But more detail on jobs
Decarbonisation will provide an impetus to many industries, especially renewable electricity and forestry which would almost double as decarbonisation boosted tree planting in order to take advantage of bio-sequestration opportunities.
This would lead to significant increases in forested land and increased sales of logs for processing and export as forest pulp. Surprisingly, we found little mention of forestry or wood processing and exports in the government’s summary.
Change in hours worked by industry under net zero scenario, 2050
Electricity would replace more than all the jobs lost in coal generation with additional jobs in renewables generation and electricity distribution and supply as more of the economy became electric-powered.
Although vulnerable industries account for less than 4% of employment across the country, some regions are much more heavily dependent on them than others.
We identify nine of Australia’s 88 statistical area level 4 regions as vulnerable to loss of employment. They include the coal-dependent regions such as Hunter in NSW, Fitzroy in Queensland and Gippsland in Victoria.
On the other hand, another 46 regions are identified as likely to gain employment. They are more highly exposed to the industries that would grow.
Change in real state product by industry under net zero scenario, 2050
By state, Tasmania benefits the most under net-zero, having more hydroelectricity, forestry and wood products industry than other states as well as no coal-fired generation. Its real gross state product would be 4.9% higher than otherwise in 2050, and employment 11,600 higher
Queensland suffers the most, because of an over-representation of coal mining, broadacre agriculture and coal-generated electricity in its economy. Its real gross state product would be 5.9% lower than otherwise in 2050, and employment 97,800 lower.
The worse outcomes need to be put into perspective. Queensland is expected to employ an extra 1.2 million people by 2050 without decarbonisation. With decarbonisation it would be slightly fewer extra people, an extra 1.1 million.
It’s important our leaders do this work too
Whatever the government does to achieve zero emissions there will be a clear need for adjustment packages to cushion impacts on those most affected.
Given that we will be embarking on decarbonisation to secure community-wide benefits, it will be appropriate for the community to fund those packages.
To do that we will need detailed projections for the parts of the economy (regions, industries, occupations by skill) that will most benefit from the changes and the parts that will be most hurt. To date, the government hasn’t told us.
This article is republished from The Conversation is the world's leading publisher of research-based news and analysis. A unique collaboration between academics and journalists. It was written by: Philip Adams, Victoria University.
Philip Adams receives funding from Victoria University..