Environmental hazards or energy solutions?
Decisions about future energy challenges are too often hindered by propaganda, half-truths and a limited grasp of the science that informs the choice and use of hydrocarbon and other resources, according to delegates at the annual conference of the British Geophysical Association (BGA), to take place in the Geological Society, Burlington House in London on 14 and 15 February.
For example, rather than being a quick fix that helps cut carbon dioxide emissions, poor quality carbon capture and storage may actually make things worse whereas 'fracking', the controversial gas and oil extraction technique, may prove to be vital in the years ahead. Leaders from universities and industry will come together to discuss these issues at the BGA meeting, where delegates will discuss the sustainability, security and risks of future energy choices.
Scientists at the conference will argue that evidence from geophysics must be part of the political decision making process, as the UK and other countries consider how to maintain the stable energy supply we depend on while simultaneously reducing the emission of carbon dioxide, one of the key greenhouse gases responsible for global warming.
At first sight, carbon capture and storage (CCS) appears to be a technological fix that allows us to carry on using the fossil fuels oil, gas and coal (hydrocarbons) to generate energy. CCS power stations could pump the resulting greenhouse gases to underground reservoirs rather than releasing them into the atmosphere.
In reality, it is not so simple. Even handling the greenhouse gases emitted by fossil fuel burning means storing something close to 3.5 billion tonnes of carbon dioxide per year, a volume comparable to the 27 billion barrels of oil produced annually. And for the storage to be worthwhile the gases must also be stored in reservoirs that leak at rates of less than 1% per thousand years, at which point their carbon footprint effectively matches that of renewable energy sources. Geophysical modelling and monitoring, to be discussed at the meeting, is needed to ensure reliable storage for the thousands of years required.
A related discussion centres on 'fracking', potentially a huge new energy source for the UK, but one that is struggling for public acceptance despite the promise it holds of lower energy prices and better energy security. Until now media coverage of fracking has centred on the perceived environmental risks, such as earthquakes and contamination of groundwater.
In his keynote address to the BGA meeting, Professor Mark Zoback of Stanford University points to the data from the ten years of gas production by fracking at 150,000 sites across the United States. US Geological Survey information demonstrates that earthquakes can result from fracking, but that serious effects can be avoided with careful choice of location. Ironically European countries that have banned fracking are now purchasing US coal for power stations and driving up carbon dioxide emissions as a result.
Intriguingly, Prof. Zoback draws a comparison between fracking and CCS. The techniques are similar – pumping fluid into rocks – and he argues therefore carry the same risks of earthquakes in some rock types and locations. The problem is that these tremors could then release carbon dioxide too quickly, well above the 1% loss per thousand years needed for CCS to be effective. If carbon capture and storage is to have any effect on greenhouse gas emissions, reservoir locations will need to be chosen with care.
Other sessions at the meeting will cover risks associated with nuclear power in the light of Fukushima, renewable energy from wind turbines and criteria for nuclear waste storage sites.
Meeting organiser Prof. Mike Kendall of the University of Bristol commented: "A reliable, affordable and environmentally friendly supply of energy is one of the major challenges facing society. And although there are numerous different options, there is no single silver bullet that will solve this challenge. The issues are clouded by misinformation and a poor public understanding of the underpinning science. Geophysicists have a key role to play in helping clarify these complex issues and can help governments make the right decisions on how we supply energy to homes and businesses in the 21st century."
Image and caption
Image and caption
An image can be downloaded from https://www.ras.org.uk/images/stories/press/saskatchewan%20oil%20field.jpg
Caption: Pumpjacks extracting oil from a southern Saskatchewan oilfield in Canada. Credit: Mike Kendall, University of Bristol
Dr Robert Massey
Prof. Mike Kendall
"New advances in Geophysics: Geophysics in Future Energy Challenges" will take place in the Geological Society of London in Burlington House, Piccadilly, London from 14 to 15 February 2013. The conference is the annual meeting of the British Geophysical Association.
Bona fide members of the media who wish to attend this meeting should present their credentials at the registration desk for free admission.
Notes for editors
Notes for editors
The British Geophysical Association (BGA, www.geophysics.org.uk) is a Joint Association of the Geological Society of London and the Royal Astronomical Society.
The aims of the British Geophysical Association are to promote the subject of geophysics, and particularly to strengthen the relationship between geology and geophysics in the UK, by holding meetings and courses, by encouraging the publication of the results of research, and by such other means as are deemed appropriate to an Association by the parent Societies.
Follow the BGA on Twitter via @britgeophysics
The Royal Astronomical Society (RAS, www.ras.org.uk), founded in 1820, encourages and promotes the study of astronomy, solar-system science, geophysics and closely related branches of science. The RAS organizes scientific meetings, publishes international research and review journals, recognizes outstanding achievements by the award of medals and prizes, maintains an extensive library, supports education through grants and outreach activities and represents UK astronomy nationally and internationally. Its more than 3500 members (Fellows), a third based overseas, include scientific researchers in universities, observatories and laboratories as well as historians of astronomy and others.
Follow the RAS on Twitter via @royalastrosoc