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THE ENERGY CHOICES WE MAKE TODAY ARE resulting in changes in the amount of carbon dioxide emitted to the atmosphere that will be seen in the composition of the atmosphere for hundreds of thousands of years. Climate change is here; it’s happening and going to be with us for thousands of years.

The last two decades have seen an upsurge in research into the potential synergies between invasive species and climate change, with evidence emerging of increased invader success under climate change. All stages along the naturalization-invasion continuum are likely to be affected, from the introduction and establishment of alien species to their spread and transition to serious invaders. A key question is whether alien plants will have a relative advantage under climate change conditions. So far, evidence for differential responses of alien invasive and native species to climate change drivers (elevated CO2) and outcomes (increasing temperature, changing rainfall patterns, changes in disturbance regimes) is mixed. Although alien invasive plants appear to be more responsive to elevated CO2 than many native species, plant response to elevated CO2 and other climate change components is dependent on environmental conditions and resource availability. Similarly, correlative modelling of species-climate relationships has not revealed clear evidence that invasive plants are likely to be able to increase the extent of suitable habitat under future climates any more than their native counterparts. We suggest that the most important driver of a shift to alien-dominated vegetation under climate change will be the superior capacity of alien invasive plants to take advantage of colonisation opportunities arising from climate change, such as extreme climatic events, changes in disturbance regimes, and widespread reduction in vegetation resilience as range margin populations decline. There are substantial challenges ahead for managing invasive plants under future climates. Weed risk assessment and management approaches must incorporate consideration of future climatic conditions. Most importantly, we will need a shift in management approaches away from a focus on the control of undesirable alien plant species to building resilience of resident vegetation assemblages, in association with targeted monitoring and early eradication of alien plant species.

Asia’s robust economic growth in the past decades has lifted millions out of poverty. From an estimated 1.4 billion people living in extreme poverty in 1990 the number had gone down to about 903.4 million by 2005.1 Still, rapid economic growth and pervasive poverty have continuously degraded the region’s natural resources. The quality of the environment has deteriorated, and climate change has had an impact, threatening the productivity and integrity of natural systems as well as people’s health, safety, and livelihoods.

The effects of climate change require strong actions from policy-makers, extension officers and communities to strengthen resilience to the expected negative impacts. Sea-level rise, changes in precipitation patterns and other effects cannot be avoided, but there are many means to reduce the vulnerability of communities. To equip the actors in this adaptation process with the right tools, the Regional Programme on Adaptation to Climate Change in the Pacific Island Region is setting up a knowledge management system including a database on climate change. A collection of best practices from the region and other parts of the world will be part of this venture. The collection of best practices from the region will be completed by the thematic teams of SPC Land Resources Division. This desk-study gathers examples from across the globe.

The Pacific-German Regional Programme on Adaptation to Climate Change supports the endeavour of Pacific countries to mainstream adaptation to climate change. Integrating climate change issues into the strategies and services of SPC programmes, and into the land use strategies and planning documents of Tonga and Vanuatu, are central aspects of the programme. But what do we mean when we talk about mainstreaming? Usually it is equivalent to integrating’ an issue into another area, such as a policy or an institution. In this document, mainstreaming adaptation refers to the incorporation of measures strategies and information to reduce vulnerability to climate change, in policies, strategies, programmes, development planning, institutions and decision-making processes.

This report is targeted at policy-makers, particularly those responsible for developing climate mitigation and adaption strategies that address issues like conservation, ecosystem services, agriculture and sustainable livelihoods. It focuses on the primary linkages between invasive species and climate change, as well as the secondary and tertiary interactions of their corresponding impacts. Finally, the enclosed recommendations are intended to provide guidance on the best ways to integrate invasive species prevention and management into the consideration of climate change responses across a range of sectors. Building on a review of existing scientific and conservation literature (which is frequently centered on well-studied invasive species in developed countries), our research has reaffirmed that there are significant gaps and questions about the intersection of these two major drivers of change. The case studies included below highlight key relationships and questions related to invasive species, climate change and the role of ecosystem-based adaptation. The three key messages that can be distilled from this report are: 1. Climate change will have direct and second order impacts that facilitate the introduction, establishment and/or spread of invasive species. 2.Invasive species can increase the vulnerability of ecosystems to other climate-related stressors and also reduce their potential to sequester greenhouse gasses. 3.Using an ecosystem-based adaptation approach, these pressures on ecosystems and their ability to provide important services can be offset by preventing the introduction of new invasive species and by eradicating or controlling those damaging species already present.