Abundant supplies of fossil fuel's are in use because they are cheep. Zero technological advances are required to provide a stable food supply for 20 billion people. It's actualy difficut to find the maximum stable food supply with current technology over the long term.
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.
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.