1. ‘The 1997 US climate change action report’, submitted by the United States of America under the ‘United Nations framework convention on climate change’, Department of State Publication no. 10496, Washington, DC, 1997.
2. Intergovernmental Panel on Climate Change: ‘Climate change: the PICC scientific assessment’, (ed. J. T. Houghton et al.); 1990, Cambridge, Cambridge University Press.