Scary, third of arable land lost in only 40 years

[iaaems]

We did something at school called 'agricultural biology'. Crop rotation was mentioned and indeed was pushed as a very positive thing to do - and it made sense.
However the massive use of chemical fertilisers etc. was not mentioned or if it was I must have missed it.
We always seem to push the boundaries to see how far we can go. This time I feel too far.
I did read something recently (a few months or so ago) about 'hydroponics'. The potential with this seems good - I am sure there are the usual pros and cons - might be worth some more investigation at some point next year perhaps.