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This document is to report on the work carried out to assess the status and the possibility of controlling beach burr (Cenchrus Echinatus) on the island of Pukapuka. This work was conducted by the National Environment Service and funded under the Regional Invasive species program.

Increasing recognition of the changes in the natural environment as a result of human interference has lead to the international community agreeing on a number of multi-lateral environmental agreements (MEAs). At the 1992 Earth Summit, world leaders agreed on a comprehensive strategy for "sustainable development" – meeting our needs while ensuring that we leave a healthy and viable world for future generations. Three key agreements from the Summit are the United Nations Convention on Biological Diversity, the United Nations Framework Convention on Climate Change and United Nations Convention to Combat Desertification. These three are known as the Rio Conventions.