I think that this report will swiftly become obsolete as better methods are found for growing meat in a petri dish, but it’s still a bit dismaying. From NewScientist (23 February 2019):
John Lynch and Raymond Pierrehumbert at the University of Oxford compared the emissions from cattle-farming and lab-grown meat, and modelled their climate impact over 1000 years (Frontiers in Sustainable Food Systems, doi.org/c2vs).
Livestock farming produces about 18 per cent of global greenhouse gas emissions, but lab-grown meat could have a bigger impact, thanks to its high energy requirements, which would mean high carbon dioxide emissions.
It still answers those who cannot abide killing animals for food, but for the environmentalist, so far artificial meat is not acceptable.