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See also: Alien Species Alert for more information

Non-native invasive species, such as insect pests and weeds, have a huge impact on livelihoods, food production and biodiversity around the world. Classical biological control (CBC) by the introduction of exotic biological control agents from the area of origin of an introduced pest provides a sustainable and cost-effective control method that minimises the use of pesticides. It has been practised widely for more than 100 years, with many successes.

To date no studies have been undertaken on the costs and benefits of IAS management in the Caribbean. This may partly explain why there has been negligible funding to combat the onslaught of these exotic species in the region. As a result it was decided to provide individuals involved in the UNEP-GEF Project, "Mitigating the Threats of Invasive Alien Species in the Insular Caribbean" with training and an opportunity to undertake Cost-Benefit Analyses (CBAs) on some selected IAS. The CBAs undertaken and reported in this publication clearly demonstrates that the benefits of managing IAS outweigh the costs.

The purpose of the project was to develop a framework for monitoring the impacts of invasive tree species on biodiversity in rural communities of Ghana (Project No. 162/9/019; 2000-2003).
Submitted by: Centre for Natural Resources and Development, NatureBureau International; Environmental Change Institute, University of Oxford; Forestry Research Institute of Ghana; Ghana Organic Agriculture Network; Suntaa-Nuntaa Agroforestry

A new scientific report, Summary for Policymakers of the Thematic Assessment Report on Invasive Alien Species and their Control of the Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services, offers the most exhaustive look yet at how nonnative plants and animals can drive extinctions, disrupt food systems and harm human health. The report was compiled by 86 experts from 49 countries, who drew on thousands of scientific studies and contributions from Indigenous people and local communities. Key points:

• Invasive Alien Species Pose Major Global Threats to Nature, Economies, Food Security and Human Health
• Key Role in 60% of Global Plant & Animal Extinctions
• Annual Costs Now >$423 Billion – Have Quadrupled Every Decade Since 1970
• Report Provides Evidence, Tools & Options to Help Governments Achieve Ambitious New Global Goal on Invasive Alien Species

FAO launches the first-ever global report, The State of the World's Biodiversity for Food and Agriculture, on the state of biodiversity that underpins our food systems. The first-ever report of its kind presents mounting and worrying evidence that the biodiversity that underpins our food systems is disappearing – putting the future of our food, livelihoods, health and environment under severe threat. Less biodiversity means that plants and animals are more vulnerable to pests and diseases. Compounded by our reliance on fewer and fewer species to feed ourselves, the increasing loss of biodiversity for food and agriculture puts food security and nutrition at risk.

The purpose of this report is to raise awareness among key stakeholders, decision-makers, policymakers and the general public about the environmental and socioeconomic impacts of IAS. Twenty-eight dedicated species accounts are provided to highlight the various types of impacts. These species accounts are based on thorough, up-to-date scientific information from recent research and studies, and highlight the multifaceted impacts of IAS at both the global and regional levels.