Climate Change: Hot Debate over Green Concrete

Climate savior or potential green-washer? Los Gatos, Calif-based startup Calera Corp has a bold idea to do something concrete about climate change—literally. With venture funding from Vinod Khosla, the company plans to take carbon dioxide emitted by coal-fired powerplants, and combine it with seawater to make a ‘green’ concrete. The process is similar to the formation of coral reefs, the company says. It even arranged for an exhibit showing the process at the California Academy of Sciences. Not so fast, says Ken Caldeira, climate scientist at the Carnegie Institution of Washington at Stanford University. “Their claim that they can put CO2 in sea water and create minerals makes no sense to me at all. When coral does make reefs, Caldeira points out, CO2 is

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