The magnitude of the required reductions
Extracted from an article by Ted Trainer [1,2]
It is not commonly understood how large the reductions would have to be to enable a society that is globally sustainable and just. The World Wildlife Foundation’s Footprint measure 2018 estimates the average Australian per capita use of productive land at 6–8 ha. Thus, if the 9–10 billion people expected to be on earth by 2050 were to live as Australians do now, up to 80 billion ha of productive land would be needed. But there are only about 12 billion ha of productive land on the planet. If one third of it is set aside for nature then each Australian would be living in a way that would require about 10 times as much productive land as all people could ever have.
Some other measures taking into account factors such as materials consumption (Wiedmann et al 2015) indicate higher multiples.
To this must be added the implications of growth. If the Australian GDP rises by 3% pa and by 2050 all 9–10 billion people rise to the “living standards” Australians would then have, each year the global economy would be 18
times as much as it does now. Yet the present amounts are unsustainable; the WWF estimates that the global footprint is now 70% higher than the planet could sustain. This indicates that the 2050 global resource and ecological impact would be in the region of 30 times a sustainable level. (For a detailed derivation of these multiples see Trainer 2021a.).
The common assumption that technical advance can solve the resource and ecological problems without impacting on affluent living standards and economic growth has now been contradicted by a large amount of evidence.
Many studies show that despite constant effort to improve productivity and efficiency the growth of GDP continues to be accompanied by growth in resource use.
Source: RWER blogs, 9 May 2022
Real-World Economics Review Trainer T., How Resource-Cheaply could we Live Well? Issue no. 99, 9 May 2022