THEY want to save the planet. The engineers who brought us cloud seeding and plans to warm Siberia by melting the Arctic now say they can stave off global warming by shading the planet with tiny metal balloons or burying greenhouse gas on the ocean floor. And climate scientists, depressed by the failure of politicians to cut emissions of greenhouse gases, are starting to take a serious interest.
The idea of global “mega-engineering” technology to combat global warming sounds fanciful, but the need for it is not. CO2 levels are forecast to double from pre-industrial levels within half…
