Just jumping on a couple of points.
Firstly I work quite closely with farms and currently they are being offered quite hefty sums to build solar on farmland, money which really does smash the equivalent returns if it was used for rape, livestock etc.
Secondly, climate change is very much real and it's causing us to change the way we farm. One particular family farm has recorded the weather every day going back to the 1800's, looking through the books you can see that whilst the yearly amount of rain we receive is pretty similar to 150 years ago we have less rainy days and when it does rain, we seem to get more than we used to. The daily temperatures certainly have ticked up and you can really notice the difference in the winter months compared to the turn of the last century.
There is one bit of good news! I worked with a couple of large French Champagne companies who are buying up farmland within Hampshire, West Sussex, Kent etc because they believe on the current trend that the UK will be able to produce sparkling wines which really will be world class in the next 10-20 years.