Great Green Wall 2.0: China is geoengineering deserts with blue-green algae

Deserts are hard to reclaim because plants cannot survive on shifting sand, but scientists in northwest China are changing that – by dropping vast amounts of blue-green algae onto the dry terrain. These specially selected strains of cyanobacteria can survive extreme heat and drought for long periods, according to China Science Daily on Thursday. When rain finally comes, they spring to life, spreading rapidly and forming a tough, biomass-rich crust over the sand. This living layer stabilises the...