The Implementation Strategy of the Land-Use and Land-Cover Change (LUCC) project specifies in greater detail the activities and projects that will fulfil the mandate outlined in the LUCC Science/Research Plan published in 1995. The project, a joint initiative of IGBP and IHDP, is addressing important global change questions on the local, regional and global scale. The planned and ongoing activities involve a wide community of natural and social scientists. The new understanding of land-use and land-cover change dynamics following from the work carried out under the LUCC Implementation Strategy will be of crucial importance to the global environmental change research community as well as to decision-makers at the local, regional and global levels.

The IGAC Science Plan and Implementation Strategy lays out the scientific objectives and key research issues of the atmospheric chemistry project of the International Geosphere Biosphere Programme (IGBP) as both IGAC and IGBP enter their second phase. It also lays out a framework for addressing these objectives and issues, recognizing the need for collaboration with partner programmes and projects. The scientific focus of this document emerged from the first decade of IGAC research, much of which was conducted in the context of focused, intensive measurement campaigns. The scope of IGAC in its next phase includes both regional characterisation and the extension into issues that cross more expansive boundaries in space, time and discipline. While local and regional-scale atmospheric chemical composition will be a primary focus, it is now clear that issues such as intercontinental transport and transformation of chemically active species and the interactions between atmospheric chemistry and climate must also be addressed in order to better understand atmospheric chemical composition and to provide guidance to the public and policy-making community.