Science

Could the world stop using fossil fuels today?

The aim of governments, local and national, should be to encourage reduced use of fossil fuels by supporting renewable energy systems.

Dave Greenberg/Shutterstock
If we stopped oil, gas and coal extraction immediately -- what would happen? What would we need to change about the way our economies and societies work in order to adjust to that resource no longer being available? Do alternatives already exist that mean it could be business as usual if we (governments and individuals) make changes, or would it mean a major adjustment to the way we live our lives?

It is not feasible to immediately stop extracting and using fossil fuels. The global economy, human health, and livelihoods currently depend heavily on oil, coal, and gas. But over time, we need to displace fossil fuels with low-carbon renewable energy sources.

The first priority should be on switching to renewable energy, not just for electricity but also for heating, cooling, and transport fuels. It will be much harder to substitute fossil fuels used for chemical processing, such as the manufacture of plastics or fertilizer, but it is technically possible with biomass (organic material from plants and animals). After all, the hydrocarbons in coal, oil, and gas were originally derived from biomass millions of years ago.

The aim of governments, local and national, should be to encourage reduced use of fossil fuels by supporting renewable energy systems.

Increasing contribution from renewables — One issue is that global subsidies for fossil fuel extraction remain large, at around US$4.7 trillion per year according to the International Monetary Fund.

In a recent global energy review, the International Energy Agency described a significant drop in energy demand from fossil fuels as a result of the COVID-19 pandemic. Demand is likely to rise again, but in the meantime, the use of renewable electricity continues to increase and now has a 25% share of global electricity.

Countries with good renewable resources can reach a significantly higher share. New Zealand, for example, now produces around 85% of its total electricity from renewable sources (including hydro, wind, solar and geothermal) without government intervention. But overall, renewable energy contributes only 40% of all energy demands in New Zealand and far less globally.

There are many examples of how renewable energy can meet intensive industry demands, in New Zealand and elsewhere. New Zealand’s aluminum smelter uses electricity generated by the country’s largest hydropower station built underground at Lake Manapōuri. A steel mill in Sweden uses “green hydrogen”, produced by using renewable electricity to split water into hydrogen and oxygen.

The Manapōuri hydro power station supplies electricity to New Zealand’s aluminium smelter.Uwe Aranas/Shutterstock

Green hydrogen can also be used to displace natural gas for heating and cooking as well as for fueling trucks, cars, boats, and planes.

The costs and benefits of change — There are many alternatives to fossil fuels with far lower carbon footprints. This includes electricity generated by nuclear power plants.

But the problem is fossil fuels remain relatively cheap, because the cost of their pollution isn’t usually factored in, and energy-dense (there is more energy contained in a lump of coal than a piece of wood of a similar size). Displacement is not easy and will take time to allow those working in the fossil fuel industry to go through a “just transition” to work in other sectors.

Government intervention is often required for low-carbon options to increase their share in meeting total energy demands. But changing people’s behavior around energy use is more challenging than deploying new low-carbon technologies to provide the same energy services.

We should not forget the additional benefits that come with a shift to low-carbon energy generation. More walking and cycling improves health, electric vehicles reduce local air pollution (compared with petrol and diesel vehicles) and using public transport and carrying more freight by rail can reduce traffic congestion. Other simple energy-saving measures – switching off lights, not wasting food – can all save money while lowering someone’s carbon footprint.

We have become a wasteful society, with consequences for the environment. Perhaps now is the time to make major adjustments to how we live before climate change impacts do it for us.

This article was originally published on The Conversation by Ralph Sims at Massey University. Read the original article here.