A Tasmanian inventor has developed a magnesium carbonate–based cement that he says will absorb carbon dioxide as effectively as rainforests do. As Fred Pearce reports in New Scientist (July 13, 2002), John Harrison wants to replace the traditional cement, made with calcium carbonate, with his new "eco-cement," which he says is cheaper to manufacture, more durable, and can soak up millions of tons of carbon dioxide from the atmosphere each year.