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In Solomon Islands, the Pacific Adaptation to Climate Change (PACC) project focused on food security, with a goal ‘to contribute to reduced vulnerability and increased adaptive capacity to adverse effects of climate change in Solomon Islands’. The pilot sites for the demonstration projects were the low lying atolls of Ontong Java and, in a second phase, Sikaiana. These atolls are extremely isolated and are highly vulnerable in many respects. Climaterelated threats mainly come from sea level rise and extreme weather events, and impacts on food security include contamination of the freshwater lens affecting crop production. Associated soil salinisation, as well as loss of land through erosion, also have serious implications for subsistence food production in locations that are already stressed.

Invasive alien species such as Spathodea campanulata (African tulip tree) threaten biodiversity in the Pacific islands as well as the economic, social, and cultural wellbeing of Pacific peoples. Despite the potential magnitude of these threats, our scientific understanding of the ecology and management of the African tulip tree is nascent. In this paper, we use data from novel surveys of households and communities to document the direct and direct impacts of African tulip tree in Fiji, focusing on those impacts which may be monetised. We use the same data to describe current management approaches and then describe a state-of-the-science, ‘‘integrated’’ management approach that employs different strategies for trees of different ages and sizes. These two approaches are then compared in a comprehensive cost–benefit analysis. We find strong arguments for pursuing the integrated management approach, which derives monetised benefits of $3.7 for each $1 spent. However, the less costly current approach is also strictly preferred to the baseline, ‘‘do nothing’’ approach, with monetised benefits of $2.7 for each $1 spent. Results of this analysis clearly show that managing African tulip tree is cost effective, even without explicitly considering biodiversity, culture, and other non-monetised benefits of control.

Taro (Colocasia esculenta (L.) Schott) plays a prominent role in the economies and cultures of Pacific Island countries such as Fiji. Unfortunately, taro is highly susceptible to invasion from taro beetles, which burrow into the corms and weaken the plants, rendering them unmarkable and prone to rot. Papuana uninodis Prell, an invasive alien species that is native to the Solomon Islands and Vanuatu, was first reported on Viti Levu (Fiji's largest island) in 1984. Since that time, taro production on Viti Levu has fallen substantially. In this paper, we employ data from surveys of households and communities to document the impacts of P. uninodis on Viti Levu. We then identify three management approaches-chemical controls, cultural controls, and switching from taro to another staple crop-and conduct a cost-benefit analysis of each. We find strong arguments for pursuing chemical control, which derives a net present value of monetised benefits of about FJ$139,500 per hectare over 50 yr, or >FJ$21 for each FJ$1 spent. Still, any of the three management options is more efficient than no management, even without any attempt to quantify the benefits to biodiversity or forest protection, underscoring the value of actively managing this invasive alien species.

The Pacific Adaptation to Climate Change (PACC) programme is the largest climate change adaptation initiative in the Pacific region, with activities in 14 countries and territories. PACC has three main areas of activity: practical demonstrations of adaptation measures; driving the mainstreaming of climate risks into national development planning and activities; and sharing knowledge in order to build adaptive capacity. The programme focuses on three key climate-sensitive development sectors: coastal zone management, food security and food production, and water resources management. The PACC programme began in 2009 and is scheduled to end in December 2014. As the first major climate change adaptation programme in the Pacific, PACC has led the way in developing and designing adaptation projects, using a ‘learning by doing’ approach. Many lessons have been learned and better practices developed as the programme has progressed. One of these is the importance of integrating gender into climate change adaptation activities. Gender was mostly overlooked during the initial stages of the programme, but significant efforts have since been made to address this shortcoming and integrate gender across programme activities. This report summarises two key documents produced by PACC as part of the drive to address gender. The first, a Gender Assessment of the programme, was carried out in 2012 to assess the level and degree that the programme addressed gender. The Gender Action Plan, which covers 2013–2014, was developed soon afterwards to address the recommendations arising from the Assessment. Activities in the Plan are currently underway, and will be reported in further PACC publications.

Climate change is already affecting development in the Pacific. Rising sea level and changing rainfall patterns are challenging infrastructure, water supply, agriculture, fisheries and natural ecosystems. Extreme weather events such as floods, droughts and cyclones are having significant impacts from the household level up to the level of national economies. They are causing great hardship for individuals and communities on many islands, threatening livelihoods, traditional cultures and natural resources. These impacts could worsen in the coming decades as climate change accelerates.

Invasive species pose an enormous threat in the Pacific: not only do they strongly affect biodiversity, but they also potentially affect the economic, social and cultural wellbeing of Pacific peoples. Invasive species can potentially be managed and their impacts can potentially be avoided, eliminated, or reduced. However, neither the costs nor the numerous benefits of management are well understood in the Pacific. Thus, we undertook cost-benefit analyses (CBAs) of managing five species that are well established on Viti Levu, Fiji: spathodea campanulata (African tulip tree), herpestus javanicus (small Asian mongoose), papuana uninodis (taro beetle), pycnonotus cafer (red-vented bulbul), and merremia peltata (merremia vine). These CBAs are informed by extensive survey data that record the incidence, management, and impacts of five species in Fiji. Wed find that the most cost-effective management option varies by species, precluding a universal solution. Nevertheless, the benefits of management often exceed the costs of management by a wide margin, arguing for a more concerted effort to control the spread of invasive species in the Pacific.

PACC project reports

For Pacific SIDS, the need for adaptation to climate change has become increasingly urgent. Long-term climate changes, including the increasing frequency and severity of extreme events such as high rainfall, droughts, tropical cyclones, and storm surges are affecting the lives and livelihoods of people in PICs. Coupled with non-climate drivers, such as inappropriate land use, overexploitation of resources, increasing urbanization and population increase, development in the region is increasingly undermined. For the low lying atolls, the likely economic disruption from climate change pressures could be catastrophic, even to the extent of requiring population relocation to other islands or adding numbers to the Pacific diaspora, with the subsequent social and cultural disruption having unknown proportions. Failure to reduce vulnerability could also result in loss of opportunities to manage risks in the future when the impacts may be greater and time to consider options limited.

The likelihood (i.e., probability) components of climate-related risks in the Cook Islands are evaluated, for both present-day and future conditions. Changes into the future reflect the influence of global warming. The risk events for which current and future likelihoods are evaluated are extreme rainfall events (both hourly and daily), drought, high sea levels, strong winds, and extreme high air temperatures. Tropical cyclone frequencies over the past century are also examined. Some climate-related human health and infrastructure risks are also investigated.