Most corn grown today in the States is for livestock, plus there's a serious water issue, especially with cattle, that drink enormous amounts of water.
... and eat a lot of feed that takes a lot of water to grow.
So, here in the US, most land
and water is used to support livestock.
I live in a desert, but I can take a 15 minute drive and see (in Summer) fields of alfalfa -- a very thirsty, premium, hay/feed crop. Rivers and reservoirs throughout the West are running dangerously low, yet livestock feed still has a priority claim.
We could go into the massive, untreated sewerage lagoons on pig farms, or the eutrification of water bodies from animal waste and fertilizer run-off, causing fish and amphibian mutations, huge die-offs from deoxygenation, and blooms of poisonous cyanobacteria.
How about the eco-effects of the massive decrease in insect and bird numbers, or the bacterial antibiotic resistance, from animal usage, that's plaguing health care?
Diet affects the whole world, the climate, and all life on the planet. It's a butterfly affect.
Q: is it moral to ignore this, and continue to increase our animal consumption?