BERLIN — The COVID-19 pandemic has ruthlessly exposed the global food system’s deficiencies, and a massive escalating hunger crisis now looms.

BERLIN — According to the latest report by the Intergovernmental Panel on Climate Change, the world’s main scientific authority on global warming, keeping global temperatures from rising more than 1.5°C above pre-industrial levels is a feasible goal.

As the world struggles to rein in emissions of climate-changing gases and limit planetary warming, a new technological silver bullet is gaining supporters.Geoengineering — the large-scale manipulation of the Earth’s natural systems — has been popularised as a means of counteracti