Carbon capture and sequestration (CCS) efforts are an important part in the mitigation of global warming, but unfortunately, progress has been rather slow, and at its current pace, the world won't be able to meet climate change targets by 2020. There are only eight active CCS projects
worldwide right now, and most of them involve pumping waste carbon dioxide down into oil wells to flush out hard-to-reach crude oil, while also storing 23 million tons of carbon dioxide underground each year. Here are a few other CCS ideas.
If you'd like to read more awesome and interesting stuff, check out this unrelated (but not entirely random!) Techdirt post