With predictions about climate change growing direr every week, geoengineering (which includes everything from fertilizing the oceans in an attempt to cajole great blooms of carbon-sucking phytoplankton to spraying particles into the upper atmosphere to make the earth more reflective) is starting to look more attractive. But the science still lags behind the ambitions. To understand how such schemes would work in practice — and what their consequences would be — it is time to start small-scale field tests.

Read Here – Foreign Affairs