What means can severe heat result in the Italian government in excess of $13B a year?

In what way can intense heat result in the Italian government over $$13 billion per year?

Aiming at Middle East facilities: Kuwait's and Bahrain's confront a new wave of Tehran attacks. Largest fire in the Nordic country's record destroys as as much as 100 houses A couple of American Military personnel Slain, One Missing in Persian Assault in Kingdom of Jordan The man made a breakthrough inside Congress - afterward the highest court changed its opinion. Lebanese Serviceman Dead in Armed Forces Vehicle Explosion within South Lebanese soil Food poisoning within restaurant chains can be rare but can sicken guests.