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Humanity has altered the planet in many detrimental ways, from the warming of our climate to the ever-diminishing wildernesses on land and in the sea. But in such a complex system as the Earth, science must always keep searching – for both solutions to problems already identified and new threats coming our way. UNEP’s Frontiers Report does this by identifying and exploring areas of emerging or ongoing environmental concern. The 2022 edition delves into three issues: noise pollution in cities, the growing threat of wildfires and shifts in seasonal events – such as flowering, migration and hibernation, an area of study known as phenology.

Humanity is waging war on nature. This is senseless and suicidal. The consequences of our recklessness are already apparent in human suffering, towering economic losses and the accelerating erosion of life on Earth. This report represents a scientific blueprint for howclimate change, biodiversity loss and pollution can be tackled jointly within the framework of the Sustainable Development Goals. The report is a synthesis based on evidence from global environmental assessments.

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.

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.

Breeding success of 5 Cory’s shearwater Calonectris diomedea sub-colonies of Lavezzu Island (Lavezzi Archipelago, Corsica) was checked annually for 25 consecutive years from 1979 to 2004. Between 1989 and 1994, 4 ship rat Rattus rattus controls were performed in several subcolonies. In November 2000, rats were eradicated from Lavezzu Island and its 16 peripheral islets (85 ha) using traps then toxic baits. We compare cost (number of person-hours required in the field) and benefit (Cory’s shearwater breeding success) of control and eradication. The average breeding success doubled when rats were controlled or eradicated (0.82) compared to the situation without rat management (0.45). Moreover, the average breeding success after eradication (0.86) was significantly (11%) higher than after rat controls (0.75). Furthermore, the great variation in breeding success recorded among sub-colonies both with and without rat control declined dramatically after eradication, suggesting that rats had a major impact on breeding success. The estimated effort needed to perform eradication and checking of the permanent bait-station system during the year following eradication was 1360 person-hours. In contrast, rat control was estimated to require 240 or 1440 person-hours per year when implemented by trained and untrained staff, respectively. Within 6 yr, eradication cost is lower than control cost performed by untrained staff and confers several ecological advantages on more ecosystem components than Cory’s shearwater alone. Improved eradication tools such as hand or aerial broadcasting of toxic baits instead of the fairly labour-intensive eradication strategy we used would dramatically increase the economic advantage of eradication vs. control. Therefore, when feasible, we recommend eradication rather than control of non-native rat populations. Nevertheless, control remains a useful management tool when eradication is not practicable.