[coldtea]

>The argument is that in order to produce 1000 calories worth of meat, more resources (e.g. land, water, greenhouse emissions) are needed than to produce 1000 calories worth of plant-based food.

Sure, but either quantity might not be the real issue on the grand scheme of things, if it's just eg. 5% of resource use or pollution.

[osense]

Unfortunately, this is not the case:

https://www.theguardian.com/environment/2010/jun/02/un-repor...

Note that the year of publication is 2010.