This site contributed two articles. One was on the blast wave accelerator launcher which could launch high gravity hardened payloads for $200-2000/kilogram. and another article a nuclear thermal rocket variant (nuclear DC-X) for launching payloads for $85-150/kilogram.
Centauri dreams looks at technology for mimicking volcanoes to cool the planet and technology for extracting and storing CO2.
There is a lot more articles on the moon, Mars and other topics.
Check out Starts with a Bang for the 108th Carnival of Space.
