Bionavitas is making a long-term bet on cheap biodiesel from algae. But more promising today is "bioremediation," or using algae to treat polluted waste water. Martin LaMonica is a senior writer ...

Diesel engine exhaust contains pollutants such as nitrogen oxides and soot particles. Although governments from the late 1990s onward encouraged their uptake in the belief they were more ...

On the barren coast of Akhfenir, Morocco, a nature-based solution to the climate crisis is taking shape. Raffael Jovine is building an oblong, mechanically stirred pool full of pea-green water. He ...