Ireland will have extensive water shortages by the middle of the century due to changes in weather patterns, it has been predicted.
Climate, Weather and Irish Agriculture, a standard textbook in third-level colleges for the last 18 years, was reissued yesterday predicting that potatoes will only be grown with irrigation on the east coast, while grass production will be pushed west of the Shannon, due to global climate changes.
The book predicts average July temperatures of between 16.6 and 18 degrees as far north as coastal Co Antrim and Derry, with general summer increases of approximately two degrees.
Highest values will be found inland in 50 years.
The book says there will likely be "modest" increases in rainfall over most of Ireland, particularly in the western seaboard counties. However, rainfall was likely to drop by 25 per cent or more in the summers in eastern and central Ireland.
These changes will have a profound impact on Irish agriculture, especially in the production of potatoes, the books says.
Grass production will be located west of the Shannon because of drought in the east and midlands.
Grass is Ireland's most important agricultural crop as it is the main feed source for livestock.
Summer drought would also have a major effect on dairying, which is one of Ireland's largest industries.
The book says studies had suggested that the demand for water will cause another urban/rural rift as the demand for a scarce commodity increases.