> Anything like this (as seen on > TV):http://news.bbc.co.uk/2/hi/programmes/6374967.stm
There isn't anything new about this at all, and the key issue, that it takes energy to recover CO2 and the original sodium hydroxide from sodium carbonate, and then even more energy to pump the CO2 underground or to the bottom of the sea, isn't even mentioned in a subclause. Currently, cement production is a major source of CO2 (2.5% of world emissions). Calcium carbonate is heated in lime kilns http://www.cs.ntu.edu.au/homepages/jmitroy/sid101/uncc/fs030.html and the CO2 is removed from CaCO3. This is therefore very low tech and well established, it's also energy intensive. As a first step for a scheme employing an alkali hydroxide/oxide, it would obviously make sense to start by collecting and sequestering the CO2 released in lime kilns. Makes a lot more sense to me anyway than putting CaO into a pond (or a "tree"), collecting the resulting CaCO3 and then putting that into a lime kiln ... --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups Global Change ("globalchange") newsgroup. Global Change is a public, moderated venue for discussion of science, technology, economics and policy dimensions of global environmental change. Posts will be admitted to the list if and only if any moderator finds the submission to be constructive and/or interesting, on topic, and not gratuitously rude. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/globalchange -~----------~----~----~----~------~----~------~--~---
