A review of natural CO2 occurrences and their relevance to CO2 storage

If carbon dioxide capture and storage becomes a large-scale widely deployed technology, concerns that emissions of CO₂ from man-made underground storage sites could have a deleterious effect on the natural environment and/or be harmful to man must be addressed.

This report addresses these concerns by describing the following:

• The origin of CO₂ emitted from underground
• The major types of natural CO₂ emissions that occur from the geosphere (the solid part of the planet beneath the atmosphere and oceans) by means of detailed case-studies
• Some of the man-made CO₂ storage projects under way around the world.

In the final chapter, we assess the relevance of natural CO₂ emissions to man-made storage sites by comparing natural CO₂ emissions with putative emission fromengineered geological CO₂ storage sites.