There are some rigions which is rich in water now,but if the climate is changed by the greenhouse effect,the bolance of water supply and demande can be upset.
It may bring drought in dry areas and it may cause floods in rainy areas.
The change of water resources have great influence on agriculture as well as on our life.
Plants grow in areas suitable for them.
If it gets warmer by the greenhouse effect, they have to move to high or north areas.
Trees can expand there distribution at a speed of 40m / year to 2km / year at most by sending there seeds.
However the greenhouse effect rises the temperature at a speed of 1.5-5.5km / year.
Therefore trees cannot catch up with the suitable climate belt, and they are to die out.
Many people live in coastal areas and they are important places for plants and animals to live.
If the earth's temperature gose up,the see level ascens because of the expan sion of seawater and the melting of the glacierss.
Consequintly it causes low areas' synking beach erosion,inbasion of seewater to fresh underground water,and so on.
The rise of the sea level will do expensive damage to southern small low islands and countries which have wide delta zone.
In these countories there are fears of typhoons and tidal waves, and even their rands are likely to sink under the sea
In case of Japan, if the sea level rises 1metr because of the greenhouse effect, 2,300km2 of coastal land will be under the high-tide sea level.
The area will be 2.7times as wide as now.
Then 4.1million people and 109-trillion-yen properties will be in danger.
The greenhouse effect causes hot and long summer.
During such a season, there is a strong lykelyhood that people get heat stroke and the mortolyty rate rises, too.
Especially mortalyty rate of old people goes up.
Moreover recent researeches show that tropics heat malaria can be prevarent in coolder areas than we have thought.
If the monthly average of the minimum temperature is more than 54F,the malaria can be prevalent.
In the worst case,northen part of China,Corea,and the western part of Japan will be in denger of the infectious disease by the year 2100.
Every summer,optochemycal oxidant,i.e.optochemycalsmog,hurts eyes and throats.
The ascent of temperature accelerates optochemycal reactions in the atmosphere,and it causes the high density of optochemycal oxidant in cities.
It will have serious influence on our helth.
There are also some fear that optochemycalsmog accelerates various environmental pollution such as water contamiuation.
Mechanism of greenhouse effect Main solution