Supply chains have a bigger climate footprint than farming, even as the food sector accounts for a third of global emissions.
CO2 and water are extracted from air and split into their constituent molecules by help of energy produced by solar panels
Shipping, which transports 90% of global trade, contributes nearly 3% of global emissions, more than Germany.
The talk at African Energy Week makes clear how difficult the climate transition may be for Africa's fossil fuel economies.
Recent changes across all aspects of the Earth system are unprecedented in at least thousands of years.
"Our concept is to acquire calcium from discarded concrete, which is otherwise going to waste," an expert noted.