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Introduction
In these days，there are increasing number of extreme weather events are changing agricultural geography and food productivity，endangering long-term food security. Drought in conjunction with the global population growth and concentration of population in urban areas is causing water shortages in dry continents. Pollutions of air and water and poor waste management are also serious threats to human health. This paper analyses the relationship between climate change and agricultural resource，population displacement and economic dislocation from various points of view，and recommends possible solutions to address these issues.
The ecological adverse impact of climate change will endanger food and water security，health，livelihoods，economy and infrastructure. History shows that people will move when they can no longer be sustained in their homelands because of serious environmental problems. The fourth assessment report of the Intergovernmental Panel on Climate Change（IPCC）identifies small islands states，including those in the South Pacific，as one of the primary global regions to be most vulnerable to climate change. Most of these island states are low-lying atolls，with limited land space，small populations and little financial resources，and more than 50% of people of Pacific Island states live within 1.5 kilometres of the shore. The IPCC report also forecasts there will be approximately 150 million environmental refugees over the world by the middle of this century；shoreline erosion，citing coastal flooding，and agricultural degradation are main factors. New Zealand government has established the “Pacific Access Category”，an immigration program that allows a yearly intake of 75 residents each from Kiribati and Tuvalu and 250 each from Tonga and Fiji to settle if they have been displaced by climate change（Widishch，2008）. In addition，host regions also need to co-ordinate and improve services in order to better meet the needs of refugees experiencing mental health breakdown，such as powerlessness，loneliness，alienation，disapproval，withdrawal and hostility. It should aim to campaign for better recognition of needs，and keep building on and utilising the skills that people already employ in their efforts to aid refugee settlement. Expertise in work with refugees is by its nature evolving in work done in everyday settings，such as health clinics，community centers and schools. It is important to consolidate and restore refugee’s hope and energy.
The annual economic loss due to land area loss is estimated to be about $ 45.6 billion worldwide，following a 50 cm rise in sea level. In the context of developing countries，the overall macroeconomic impact of sea-level rise would amount to about 30% of current GNP in the coastal zone（Frankhauser，1995）. In addition，sea-level rise will increase salinity in surrounding coastal areas，significantly reducing yields from food crops and endangering drinking water supplies. Loss of agricultural land in the coastal zone causes food shortage elsewhere in the country may lead to large numbers of displacement. Recently，the great majority of environmental migrants originate densely in coastal zones，because sea-level rise will permanently damage highly productive and extensive low-lying coastal areas which are home to millions of people. Most environmental migrants move to settle in urban centers in their home countries，a smaller proportion migrates to neighbor countries，and an even smaller fraction people move long distances to developed countries. Usually，displacement makes migrants economically vulnerable，causing increased poverty and insecurity. The economical burden thus particularly falls on least developed countries to settle these migrants. Additionally，more people will be forced to migrate in the future，that will create social conflicts，especially in the countries with poor resource. According to rapid increase of climate refugees from developing countries，international migration policies and programs need to be formulated. Assistance should be provided to enable people to stay in their own communities with their own cultures. Regional rehabilitation and resettlement must be encouraged to a great extent before the onset of widespread rise of sea level. Moreover，relocation and displacement can also have significant mental health effects，and are also associated with major depression. On another level，the extend of climate crisis，and worry over future impacts on health and the environment，have already lead to concern in the general population. It is necessary to set effective public health communication that inspires action rather than stress and despair.
In these days，there are increasing number of extreme weather events are changing agricultural geography and food productivity，endangering long-term food security. Drought in conjunction with the global population growth and concentration of population in urban areas is causing water shortages in dry continents. Pollutions of air and water and poor waste management are also serious threats to human health. This paper analyses the relationship between climate change and agricultural resource，population displacement and economic dislocation from various points of view，and recommends possible solutions to address these issues.
The ecological adverse impact of climate change will endanger food and water security，health，livelihoods，economy and infrastructure. History shows that people will move when they can no longer be sustained in their homelands because of serious environmental problems. The fourth assessment report of the Intergovernmental Panel on Climate Change（IPCC）identifies small islands states，including those in the South Pacific，as one of the primary global regions to be most vulnerable to climate change. Most of these island states are low-lying atolls，with limited land space，small populations and little financial resources，and more than 50% of people of Pacific Island states live within 1.5 kilometres of the shore. The IPCC report also forecasts there will be approximately 150 million environmental refugees over the world by the middle of this century；shoreline erosion，citing coastal flooding，and agricultural degradation are main factors. New Zealand government has established the “Pacific Access Category”，an immigration program that allows a yearly intake of 75 residents each from Kiribati and Tuvalu and 250 each from Tonga and Fiji to settle if they have been displaced by climate change（Widishch，2008）. In addition，host regions also need to co-ordinate and improve services in order to better meet the needs of refugees experiencing mental health breakdown，such as powerlessness，loneliness，alienation，disapproval，withdrawal and hostility. It should aim to campaign for better recognition of needs，and keep building on and utilising the skills that people already employ in their efforts to aid refugee settlement. Expertise in work with refugees is by its nature evolving in work done in everyday settings，such as health clinics，community centers and schools. It is important to consolidate and restore refugee’s hope and energy.
The annual economic loss due to land area loss is estimated to be about $ 45.6 billion worldwide，following a 50 cm rise in sea level. In the context of developing countries，the overall macroeconomic impact of sea-level rise would amount to about 30% of current GNP in the coastal zone（Frankhauser，1995）. In addition，sea-level rise will increase salinity in surrounding coastal areas，significantly reducing yields from food crops and endangering drinking water supplies. Loss of agricultural land in the coastal zone causes food shortage elsewhere in the country may lead to large numbers of displacement. Recently，the great majority of environmental migrants originate densely in coastal zones，because sea-level rise will permanently damage highly productive and extensive low-lying coastal areas which are home to millions of people. Most environmental migrants move to settle in urban centers in their home countries，a smaller proportion migrates to neighbor countries，and an even smaller fraction people move long distances to developed countries. Usually，displacement makes migrants economically vulnerable，causing increased poverty and insecurity. The economical burden thus particularly falls on least developed countries to settle these migrants. Additionally，more people will be forced to migrate in the future，that will create social conflicts，especially in the countries with poor resource. According to rapid increase of climate refugees from developing countries，international migration policies and programs need to be formulated. Assistance should be provided to enable people to stay in their own communities with their own cultures. Regional rehabilitation and resettlement must be encouraged to a great extent before the onset of widespread rise of sea level. Moreover，relocation and displacement can also have significant mental health effects，and are also associated with major depression. On another level，the extend of climate crisis，and worry over future impacts on health and the environment，have already lead to concern in the general population. It is necessary to set effective public health communication that inspires action rather than stress and despair.