>What are the alternatives? This is exactly the right question. Assuming that the goal is a reduction in atmospheric CO2, there are many alternatives that are

>What are the alternatives? This is exactly the right question. Assuming that the goal is a reduction in atmospheric CO2, there are many alternatives that are at least an order of magnitude more cost-effective. Of those, more land based wind and solar plants are for now the best. The cost of land generally is almost negligibly small - about 0.4% of total for a recent project I looked at. Admittedly, this was in Australia, but given that solar power stations cost circa $0.5 million per hectare in equipment and installation, land (rural land of course) would need to be pretty expensive before it became a significant factor.