Business Green: Scientists seeking a cost-effective means of sequestering carbon dioxide using natural geological reactions were given a major boost last week when new research was released showing that the US alone has 6,000 square miles of rocks at or near the Earth’s surface capable of naturally soaking up millions of tonnes of CO2. The study from scientists at Columbia University’s Earth Institute and the US Geological Survey found that there are large swathes of ultramafic rock in California, …