Progress in breeding perennial clovers for temperate agriculture.
Anecdotal evidence of poor storage behaviour suggests that other moist, temperate woodland species may also be only weakly or transiently desiccation tolerant.
In temperate countries today they are kept mainly for the production of meat, wool and milk.
Although outbreaks of leptospirosis in tropical countries have been described, they seem to be rare in temperate zones where usually only sporadic cases occur.
In temperate countries, it is often admitted that the annual incidence of varicella almost equals the size of the birth cohort.
The disease has a worldwide geographical distribution and occurs in all continents, including circumpolar, temperate, subtropical and tropical zones, especially in undeveloped and developing countries.
Tropical and temperate environments have existed continuously on earth for hundreds of millions of years; polar conditions are relatively new.
What then would be the natural and almost inevitable effects of the gradual change into the present more temperate climate?
