Annual global investment in water infrastructure, e.g. canalization, dams or power stations, exceeds 500 billion US dollars.

When planning new infrastructure and renewing decaying one non-stationarity has to be taken into account.

"Large projected changes in runoff push hydroclimate beyond the range of historical behavior, " says Kundzewicz.

During this period the foundations of all the important characteristics, such as attitudes, vision, thinking, aptitudes and language, are laid down.

After this age learning requires more of a conscious effort and becomes more difficult.

During the first six years of life the brain is changing more from learning and acquiring language skills than on any of the other cognitive skills.

Children are born with the natural ability to imitate pronunciation and work out any language for themselves, without the need for the conscious study of grammar-based rules, which is why learning is quicker and easier at this age.

Children are much better at learning languages than adults and are able to acquire a foreign language much easier and faster if they begin at an early age.