1.1. Average Temperature Increase
Climate condition data from long-term observation showed that in general average temperature is increasing in
many parts of the world. The increase of average temperature might be beneficial for agriculture production as
colder climate region become warmer; cultivation of crops that were impossible to grow before becomes feasible.
On the contrary, currently well-known growing regions might not be suitable for cultivation in the future anymore,
as the average temperature is getting too high. This condition might trigger a shift in suitable locations for some
varieties cultivation in order to obtain high quality harvest [3]. The influence of higher temperature to the tea
cultivation might not be as devastating as winegrape cultivation but never the less, higher temperature regimes
reduces tea yield [4]. In the case of Japan, meteorogical data clearly showed that for 120 years period from 1891 to
2011 the average temperature trend is increasing by 1.15oC/100 Years [5].