I have written before about how the anthropogenic global warming activists are not interested in developing technologies that would scrub CO2 from the atmosphere. They only want to stop using fossil fuel even at the cost to the world's economy of scrapping much of our energy infrastructure while there is no feasible alternative. One interesting question is how did the AGW group determine what the optimum atmospheric CO2 concentration is. The US supreme Court has decided that CO2 is a pollutant, apparently not realizing that it takes a CO2 concentration of about 160 ppm(v) to sustain life as e know it. Some studies have shown that, in terms of plant growth, the optimum CO2 level is 2 or 3 times the current level of 380 ppm(v). I think the reaction of AGW activists to studies of CO2 removal from the atmosphere reveal their true agenda, which is toward an international socialistic government rather than true concern about the environment. Here is another view on this subject:

http://www.heartland.org/Article.cfm?artId=23547