Ocean carbon solutions face growth and environmental challenges

A growing industry is racing to engineer a solution to global warming, using the absorbent power of the oceans which already regulate Earth’s climate by absorbing heat and carbon. Dozens of companies and academic groups are pitching the same theory: that sinking rocks, nutrients, crop waste or seaweed in the ocean could lock away climate-warming carbon dioxide for centuries or more. Nearly 50 field trials have taken place in the past…