Caution urged over use of ‘carbon unicorns’ to limit warming
Climate scientists meeting in Korea are being urged to avoid relying on untested technologies as a way of keeping global temperature rise under 1.5C.
The Intergovernmental Panel on Climate Change will shortly publish a report on how the world might stay below this limit.
Early drafts said it would require machines to suck carbon out of the air.
The ideas are unrealistic, said one expert, calling them “carbon unicorns”.
The IPCC special report, to be released on Monday, is expected to point towards the use of technology as a critical part of efforts to keep below the guardrail figure.
The pathways to keeping below 1.5C required rapid reductions in global greenhouse gas emissions with net-zero reached by the middle of this century.
If emissions continue at the present rate, the world would “overshoot” 1.5C by 2040.
If this happens, researchers believe that carbon dioxide removal technologies, in some form, would be needed to help bring the Earth’s temperature back down.
The IPCC report is expected to mention a number of approaches that range from planting more trees, to direct air capture of CO2, to bioenergy with carbon capture and storage (BECCS).
Full story at The BBC