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The Asia and Pacific region is extremely vulnerable to the impacts of climate change. Unabated warming could significantly undo previous achievements of economic development and improvements of living standards. At the same time, the region has both the economic capacity and weight of influence to change the present fossil-fuel based development pathway and curb global emissions. This report sheds light on the regional implications of the latest projections of changes in climate conditions over Asia and the Pacific. The assessment concludes that, even under the Paris consensus scenario in which global warming is limited to 1.5°C to 2°C above preindustrial levels, some of the land area, ecosystems, and socioeconomic sectors will be significantly affected by climate change impacts, to which policy makers and the investment community need to adapt to. However, under a Business-As-Usual (BAU) scenario, which will cause a global mean temperature rise of over 4°C by the end of this century, the possibilities for adaptation are drastically reduced. Among others, climate change impacts such as the deterioration of the Asian “water towers”, prolonged heat waves, coastal sea-level rise and changes in rainfall patterns could disrupt ecosystem services and lead to severe effects on livelihoods which in turn would affect human health, migration dynamics and the potential for conflicts. This assessment also underlines that, for many areas vital to the region’s economy, research on the effects of climate change is still lacking.

Rodents remain one of the most widespread and damaging invasive alien species on islands globally. The current toolbox for insular rodent eradications is reliant on the application of sufficient anticoagulant toxicant into every potential rodent territory across an island. Despite significant advances in the use of these toxicants over recent decades, numerous situations remain where eradication is challenging or not yet feasible. These include islands with significant human populations, unreceptive stakeholder communities, co-occurrence of livestock and domestic animals, or vulnerability of native species. Developments in diverse branches of science, particularly the medical, pharmaceutical, invertebrate pest control, social science, technology and defense fields offer potential insights into the next generation of tools to eradicate rodents from islands. Horizon scanning is a structured process whereby current problems are assessed against potential future solutions. We undertook such an exercise to identify the most promising technologies, techniques and approaches that might be applied to rodent eradications from islands. We highlight a Rattus-specific toxicant, RNA interference as species-specific toxicants, rodenticide research, crab deterrent in baits, prophylactic treatment for protection of non-target species, transgenic rodents, virus vectored immunocontraception, drones, self-resetting traps and toxicant applicators, detection probability models and improved stakeholder community engagement methods. We present a brief description of each method, and discuss its application to rodent eradication on islands, knowledge gaps, challenges, whether it is incremental or transformative in nature and provide a potential timeline for availability. We outline how a combination of new tools may render previously intractable rodent eradication problems feasible.

Rodent eradications undertaken on tropical islands are more likely to fail than eradications undertaken at higher latitudes. We report on 12 independent rodent eradication projects undertaken on tropical islands that utilized the results of an in situ bait availability study prior to eradication to inform, a priori, the bait application rate selected for the eradication. These projects also monitored bait availability during the eradication. The results from our analysis verified the utility of bait availability studies to future rodent eradication campaigns and confirmed the influence of two environmental factors that can affect bait availability over time: precipitation prior to the study and the abundance of land crabs at the study site. Our findings should encourage eradication teams to conduct in-depth assessments of the targeted island prior to project implementation. However, we acknowledge the limitations of such studies (two of the projects we reviewed failed and one removed only one of two rodent species present) and provide guidance on how to interpret the results from a bait availability study in planning an eradication. Study design was inconsistent among the twelve cases we reviewed which limited our analysis. We recommend a more standardized approach for measuring bait availability prior to eradication to provide more robust predictions of the rate at which bait availability will decrease during the eradication and to facilitate future comparisons among projects and islands.

In response to the dire social and economic consequences predicted to result from climate change—especially for the most vulnerable populations in developing countries— policy makers around the world are working toward a new long-term international framework to address this global challenge. Asia and the Pacific has the world’s most dynamic economies but also the greatest number of people at risk from climate change as well as the fastest-growing emissions of greenhouse gases (GHGs)—the cause of global warming. Unless Asia and the rest of the world act to stabilize GHG emissions, poverty reduction efforts will experience new threats from climate-induced risks to the health, safety, and productivity of the poor. Such impacts are already affecting populations across the region, so even with aggressive actions, measures are needed to protect the most vulnerable from the adverse effects of sea level rise, melting glaciers, more frequent and severe climate-related natural disasters, greater variability of rainfall, and other predicted consequences of climate change.

A strong state reinforces investment yield, whether this results from public or private sector investment. Th e development needs of a weak state must diff er from those of a strong state. Th e fragile states of the Pacifi c are not the dynamic societies of Asia.1 Th ese may sound like obvious statements but the special needs of Pacifi c fragile states have not been apparent in earlier approaches to development in the Pacifi c region. Current Asian Development Bank (ADB) regional and country strategies and programs diff er from those of earlier years. Emphasis on maintaining project loan portfolios has been lessened and replaced by an emphasis on strengthening state operations, including testing and strengthening the demand for reform, and engaging civil society in development decisions. Th e shift is toward greater participation in development with the aim of building demand for good governance and reform to support performance-oriented delivery of public and private goods and services.

Recent studies have shown that the Cook Islands' social infrastructure has limited preparedness against weather-related vulnerability. The inherent geographical vulnerability of the country to climate change can be ameliorated by initiating integrated infrastructure and social development, including human resources development.