<
https://reneweconomy.com.au/sucking-carbon-from-the-air-essential-to-limit-warming-but-its-going-to-need-a-lot-of-energy/>
"Novel carbon dioxide removal technologies such as direct air carbon capture
and storage (DACCS), will be essential if the world wants to come close to 2050
temperature targets, according to a new report, but not without putting heavy
pressure on energy systems.
DACCS, in particular, must be powered by carbon-free energy to be viable,
according to the second
State of Carbon Dioxide Removal report, released
today.
As ever-rising levels of CO₂ in the atmosphere threatens to create hundreds, if
not thousands of years of temperature changes on Earth, researchers are
increasingly looking at geoengineering techniques to directly extract the gas
from the air.
This is already happening at a small scale – and with significant confusion
over whether it is even working – using conventional methods such as
afforestation/reforestation and forest management, peatland and coastal wetland
restoration, and soil carbon sequestration.
But to meet the 7-9 thousand tonnes (Gt) threshold of carbon dioxide that needs
to be removed every year from the atmosphere by 2050, just to meet the Paris
Agreement 1.5°C target, novel and strange techniques need to be brought in as
well, the report says.
These include ocean fertilisation where nutrients are added to the sea to suck
out CO₂; enhanced rock weathering where crushed rock-plus-rain does the same;
turning biomass such as farm residue into charcoal-like biochar and; bioenergy
with carbon capture and storage (BECCS)."
Cheers,
*** Xanni ***
--
mailto:xanni@xanadu.net Andrew Pam
http://xanadu.com.au/ Chief Scientist, Xanadu
https://glasswings.com.au/ Partner, Glass Wings
https://sericyb.com.au/ Manager, Serious Cybernetics
