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 Features Carbon busters: 8 climate change solutionsAs carbon dioxide levels creep ever higher, scientists are working to put greenhouse gas in its place. We investigate carbon sequestration.  A new bottom lineWhat is the collective impact of 6.7 billion human beings on one planet? David Suzuki ponders the problem of exponential population growth.  Are we alone?There could be more than 200 extraterrestrial civilisations humming away in our galaxy right now. Cosmos wonders where they are.  Weird worldsCould planets made of diamond or iron exist? While hundreds of exoplanets have already been discovered, it could just be a matter of time before we find some truly bizarre ones.  The mysterious colour purpleChina's Terracotta Army was unearthed in 1974, but the mystery of a pigment on the warriors continues to intrigue archaeologists, chemists and physicists today.  Apollo led to cosmic shift in human conditionOne of the many legacies of the Apollo program was the way it caused an extraordinary, enduring – and, for some, troubling – change in how we perceived the universe and our place in it.  Space Week: Did 1969 mark the end of the dream?If visions conjured by the first lunar landing were to be believed, by the 21st century we would be colonising the Moon, honeymooning on Mars and scouting the moons of Jupiter.  Space Week: Why the Moon rocksWhat we’ve learned from the Moon landings over the past 40 years has given scientists good reasons to return to our nearest heavenly body.  Crocodile's diet may be key to survivalCrocodiles may have survived millenia, but they're facing threats from climate change to cane toads. A thorough understanding of their diet may be necessary to help them survive.  Tipping point?Are we approaching a juncture where technology will accelerate exponentially and we'll merge with machines? We review the radical concept of the singularity.  We are the robotsA powerful artificial intelligence won't spring from a sudden technological 'big bang', it's already evolving symbiotically along with us, says AI leader Rodney Brooks.  Mystery of missing sunspots solvedThe Sun is in the pits of a century-class solar minimum, and sunspots have been puzzlingly scarce for several years. Now, solar physicists think they understand why.  Black harvest: the battle against wheat rustA global scourge is spreading that could devastate food supplies. To fix the crisis comes Norman Borlaug, the man who saved the world before ... and needs to again.  Cosmic collisionsThere's a suspicion among scientists that, not only may we be able to detect parallel universes, but that they may occasionally collide with our own universe.  Preparing for doomsdayClimate change, resurgent diseases and a growing population are all having an impact on global food security. It's an important nut to crack – and part of the solution is a vast library of seeds. 
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