Researchers have developed porous materials that can soak up 80 times their volume of carbon dioxide, offering the tantalizing possibility that the greenhouse gas could be cheaply scrubbed from power-plant smokestacks. After the carbon dioxide has been absorbed by the new materials, it could be released through pressure changes, compressed, and, finally, pumped underground for long-term storage.
The "pumping it underground" part is obviously still an issue, because "What are you going to do with millions of tonnes of carbon dioxide that is not nearly as compact as nuclear waste?". And what happens if the pipe-line carrying your CO2 breaks, spills into a low-lying area, and suffocates anything living there?
Nevertheless, an interesting first step.