Acknowledgements.--Preface.--Forword.--List of authors.-- Keynote Address: Some sobering environmental concerns and flickering prospects of cures / by Thomas G. Hallam.--PART I -- AIR POLLUTION. Some aspects of mathematical modelling of atmospheric transport and chemistry / by L.K. Peters.-- Attenuation of air pollution by green belt / by R.K. Kapoor and V.K. Gupta. Dispersion of a reactive air pollutant in a two layered environement / by J.B. Shukla and R.S. Chauhan. Dispersion from a time dependent point source: Application to methyl isocynate leakage in Bhopal, India / by R.S. Chauhan, J.B. Shukla and T.G. Hallam.--PART II -- WATER POLLUTION. Taking advantage of topography in the siting of discharges in rivers / by Ronald Smith. Analytical solution of 3-D unsteady state diffusion equation for a pollutant from a point source discharge in offshore region / by V.P. Shukla.--PART III -- POPULATION ECOLOGY. Modelling survival in chemically stressed populations / by T.G. Hallam. On the general structure of epidemic models / by E. Beretta and V. Capasso. Equilibria and oscillations in age- structured population growth models / by J.M. Cushing. --PART IV -- COMMUNITY ECOLOGY. Young predation and time delays / by M. Saleem, V.S. Siddiqui and V. Gupta. Uniform persistence and global stability in models involving mutualism. 1. Predator- prey-mutualistic systems / by H.I. Freedman and B. Rai.-- PART V -- RESOURCE MANAGEMENT. Dynamic interactions between economic, ecological and demographic variables / by Alessandro Cigno. Economic growth models: Effects of logistic population and technology / by Ajai Shukla. A dynamic predator-prey model for the utilization of fishery resources: A case of trawling in Lake Kasumigaura / by Y. Kitabatake.