Title: Global environmental impacts of the hydrogen economy

Authors: Richard Derwent, Peter Simmonds, Simon O'Doherty, Alistair Manning, William Collins, David Stevenson

Addresses: Centre for Environmental Policy, Imperial College London, Silwood Park, Ascot, Berkshire, UK. ' School of Chemistry, University of Bristol, Bristol, UK. ' School of Chemistry, University of Bristol, Bristol, UK. ' The Met Office, Exeter, Devon, UK. ' The Met Office, Exeter, Devon, UK. ' Institute for Atmospheric and Environmental Science, University of Edinburgh, Edinburgh, UK

Abstract: Hydrogen-based energy systems appear to be an attractive proposition in providing a future replacement for the current fossil-fuel based energy systems. Hydrogen is an important, though little studied, trace component of the atmosphere. It is present at the mixing ratio of about 510 ppb currently and has important man-made and natural sources. Because hydrogen reacts with tropospheric hydroxyl radicals, emissions of hydrogen to the atmosphere perturb the distributions of methane and ozone, the second and third most important greenhouse gases after carbon dioxide. Hydrogen is therefore an indirect greenhouse gas with a global warming potential GWP of 5.8 over a 100-year time horizon. A future hydrogen economy would therefore have greenhouse consequences and would not be free from climate perturbations. If a global hydrogen economy replaced the current fossil fuel-based energy system and exhibited a leakage rate of 1%, then it would produce a climate impact of 0.6% of the current fossil fuel based system. Careful attention must be given to reduce to a minimum the leakage of hydrogen from the synthesis, storage and use of hydrogen in a future global hydrogen economy if the full climate benefits are to be realised.

Keywords: hydrogen economy; greenhouse effect; environmental impact; greenhouse gases; global warming; hydrogen production.

DOI: 10.1504/IJNHPA.2006.009869

International Journal of Nuclear Hydrogen Production and Applications, 2006 Vol.1 No.1, pp.57 - 67

Published online: 20 May 2006 *

Full-text access for editors Access for subscribers Purchase this article Comment on this article