House, K. Z., et al (2011): Economic and energetic analysis of capturing CO2 from ambient air
House, K. Z.; Baclig, A. C.; Ranjan, M.; van Nierop, E. A.; Wilcox, J.; Herzog, H. J. (2011): Economic and energetic analysis of capturing CO2 from ambient air. In: Proceedings of the National Academy of Sciences.
Cost analysis for air caputre technology which shows that it is more expensive than expected.