Small islands and the IPCC
Most people are well aware of the globally relevant findings contained in the Third Assessment Report of the Intergovernmental Panel on Climate Change (IPCC): that the most probable projected increases in global mean temperature to 2100 lie between 1.4°C and 5.8°C while those for rises in global mean sea level to 2100 lie between 9 cm and 88 cm (see Tiempo, Issue 38/39, June 2001).
But what of the specific findings of the IPCC for the most vulnerable countries, the small island developing states?
Small islands, sensitive microcosms of the Earth system, can be considered as a bell weather to the rest of the world. Such a utilitarian view is, however, somewhat short-sighted. What about the futures of the island inhabitants themselves? What about the intrinsic values of the island systems, so often portrayed as the innocent victims of global warming?
In the small islands chapter of the IPCC Third Assessment Report on Impacts, Adaptation, and Vulnerability (see page 25 of this issue), we find more focused statements. To paraphrase these statements:
It is necessary to place a caveat on the last point since recent trends indicate surface temperatures in the tropical Pacific are becoming more El Niño-like. For example, the eastern tropical Pacific has warmed more than the western tropical Pacific, with a corresponding eastward shift in rainfall. Many models project that these trends will continue.
But the huge uncertainties associated with the most crucial projections is sobering. There is, for example, insufficient information to provide conclusive statements as to how global warming will influence tropical cyclones, in many cases a source of major human and environmental devastation for small islands.
There are, however, findings documented in the Third Assessment Report that are arguably of even greater significance to small island states.
Climate change is no longer a phenomenon we have the luxury to plan for. It is happening now and small island states are in the front line of its adverse impacts. The evidence? Many of the recently observed and now well-documented changes in aquatic, terrestrial and marine environments globally are consistent with recent changes in the global system. Of more direct and hence of more immediate relevance, small island countries are already experiencing disruptive changes, again consistent with many of the anticipated consequences of global climate change.
These consequences include extensive coastal erosion, coral bleaching, persistent alteration of regional weather patterns, and decreased productivity in fisheries and agriculture for reasons such as higher sea levels making some soils too saline for cultivation of traditional crops. Coastal roads, bridges, foreshores and plantations are suffering increased erosion, even on islands that have not experienced inappropriate coastal development, and recent devastating droughts have hit export crops and caused serious water shortages in many Pacific island countries.
Yet another consequence of global climate change is the evidence of more widespread and frequent occurrence of mosquito-borne diseases. These diseases are even being reported in the highlands of Papua New Guinea and the Solomon Islands where previously it was too cold for mosquitoes to survive.
These and other precursors of global climate change impacts experienced by small island states provide some of the more compelling and tangible indications of the seriousness of global warming, certainly more than the often quoted projections of increased global temperature and sea levels. The adverse consequences of climate change are already an unfortunate reality for many small islands people. They highlight the serious and wide-reaching further consequences future climate changes will have on small island countries, changes which will likely exacerbate the existing adverse impacts of the high natural variability of the climate and related systems.
Small island states are likely to be among the countries most seriously impacted by climate change, including sea-level rise, despite being the smallest contributors to human-induced climate change, but they have a seriously limited capacity to adapt to the adverse impacts of climate change.
In regard to these issues the Technical Summary of the Third Assessment Report makes the following observations with reference to small island states:
A concerted effort is required to rectify the current inability to provide detailed characterizations of climate change for small island states. Until recently, planning for climate change has been hampered by a lack of integrated approaches that reflect the highly interdependent nature of natural and socio-economic systems in small island states.
Despite the plethora of needs, and barriers to them being addressed, there is some ground for cautious optimism. Three recent examples will be given here.
Funding mobilized for adaptation
At the recently concluded Sixth Conference of the Parties to the United Nations Framework Convention on Climate Change (UNFCCC), new sources of funds were approved for projects and schemes to help developing countries adapt to the impacts of climate change. The funding streams are the Special Climate Change Fund and a special fund for the Least Developed Countries. European Union countries, Switzerland and Canada have already pledged US $410 million towards the Funds, with an additional US $10 million pledged from Canada specifically to kick-start the Least Developed Countries Fund.
Example of capability enhancement
The Pacific Island Climate Change Assistance Programme (PICCAP) is a Global Environment Facility-funded regional climate change project. It involves ten Pacific island countries (Cook Islands, Federated States of Micronesia, Fiji, Kiribati, Marshall Islands, Nauru, Samoa, Solomon Islands, Tuvalu, Vanuatu) and is coordinated and executed by the South Pacific Regional Environment Programme (SPREP).
PICCAP has been designed in such a way as to strengthen the capacities of participating countries, in terms of training, institutional strengthening and planning activities, so as to enable them to meet their reporting obligations under the UNFCCC. Success has been measured, in part, by all the participating countries under PICCAP having submitted their initial national communications prior to the fifth Conference of the Parties to the UNFCCC.
Through its sub-regional approach, PICCAP has fostered greater sharing of information, built up a qualified pool of climate change experts from with the Pacific island region, instituted cross-sectoral climate change country teams with technical and policy-related functions, established a database of climate change information, and assisted with the development of national climate change action plans which have formed the basis for initial national communications and the implementation of the UNFCCC at a national level.
Examples of methodologies and tools
The numerous and well-developed interactions between the natural and human systems of island countries means that integrated assessment tools are of particular relevance. Once such tool that has proved particularly beneficial is VANDACLIM, an integrated assessment model based on the imaginary island country of Vanda. The model was developed by the International Global Change Institute at the University of Waikato in New Zealand, in collaboration with SPREP and the United Nations Institute for Training and Research to support training and other capacity enhancement activities.
The main components of VANDACLIM are: time-dependent projections of global-mean temperature and sea-level change to 2100; a regional climate change scenario generator; and sectoral impact models covering agriculture, the coastal zone, human health and water resources. The user has considerable flexibility in generating scenarios, being able to choose among a large range of projections from greenhouse gas emission scenarios, several global climate model patterns, and the year of interest.
A wide number of models are available for use in vulnerability and adaptation assessments of agriculture, ranging from relatively simple biophysical indices to complex process-based models.
Two methods for assessing impacts of climate change and sea-level rise on the Vanda coast have been incorporated into VANDACLIM. The first method includes a variant of the Bruun Rule, suitable for assessing time-dependent erosion of beach and dune systems. The second method includes a simple inundation model (drowning concept) suitable for the flat, low-lying deltaic coastal plains.
Health impacts can be examined using a biophysical index which estimates potential incidence of malaria as influenced by temperature and rainfall and a simple threshold index for estimating change in risk of cholera outbreaks as a result of flooding.
For water resources, three models are included: an atmospheric water balance model for assessing the water resource situation for the country as a whole; a water balance-river discharge model that is used for estimating monthly mean discharge for evaluation of wet and dry season river flow, and a discharge-flood area model that is used for the areal extent of flooding.
It is gratifying to witness the increasing mobilization of resources and the other developments that will help assist small island states to both assess and mitigate the adverse consequences of climate change and variability, including sea-level rise. That such efforts also help maintain, if not improve, the quality of life for vulnerable peoples and protect the valued natural systems of these island countries, is an added and welcome bonus.
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