For example: "there are 1.3 billion cattle in the world today"
Now some of them are a net food source because they feed in areas that humans can't. But, effectively feeding cows costs the world well over 1 billion humans worth of food.
Topsoil does not actually get destroyed. Rivers just deposit it as silt which can be recovered.
etc.
RBST can reduce that impact. http://www.google.com/search?q=rbst+efficiency
rbST reduces carbon footprint of dairies
The present study demonstrates that use of rbST markedly improves the efficiency of milk production and mitigates environmental parameters, ...
Interesting. Silt also piles up behind dams. http://www.google.com/search?q=irn+dams+silting Perhaps dam silt could be even-more easily recovered.
fossil fuel, however, is still an issue.
So, there is plenty of work to do to see that this problem stays solved.