Even with the shift away from crates and other improved practices, as the fast - expanding global middle class moves up the protein chain, demand for meat relentlessly rises. (dotearth.blogs.nytimes.com)
There's very little sign of the burgeoning global middle class wanting to give up the modern conveniences. (earthsky.org)
While livestock production accounts for around one - fifth of greenhouse gas emissions, the authors say the use of algae as a feedstock could greatly increase the efficiency of this production as a growing global middle class eats more meat and poultry than ever before. (synbioproject.org)