> "One kilogram of steak needs up to 25 kilos of grain and 15,000 liters of water"

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.

> "Meat just makes up 18% of our calories humans eat"

Same argument: even though meat makes up only 18% of calories in our diets, it produces 58% of agriculture-produced greenhouse gases and takes up a whopping 83% of currently farmed land, compared to overall agriculture [1][2]

[1] https://en.wikipedia.org/wiki/Environmental_impact_of_meat_p... [2] https://www.theguardian.com/environment/2018/may/31/avoiding...