"John Williamson" wrote in message
...
Simon Brown wrote:

"harry" wrote in message
The other factor of course being global warming which
will disprupt agriculture however it manifests itself.

With relatively cold places like Britain, it may well be
a good thing for agriculture if it actually does produce
some warming.

The global warming theory says that while the average global temperature
will increase, local effects will often differ greatly. For instance, if
the Arctic ice melts enough, the North Atlantic conveyor current may well
slow down or stop, reducing the amount of heat it brings North. This will
give the UK colder winters and, probably, wetter Summers. Or maybe,
hotter, drier Summers.

If it does produce hotter drier summers, that would likely be a
good thing for agriculture given that it's currently on the cool
side compare with some other more productive agricultural areas.

The increase in CO2 is likely to have more
effect on crop growth than any temperature changes here.

Sure, but that is not the global warming that we were discussing.