Agroecology. Properties and principles of agroecosystems. Environmental impact of agriculture. Pesticides and fertilisers in the environment. Sustainability of agricultural systems. Climate change and its impact on agriculture. Environment management systems (ISO standards). Economic significance and importance of weather. Introduction to meteorology. Earth's atmosphere. Atmospheric energy. Atmospheric moisture and precipitation, atmospheric motion. Weather patterns over Mauritius. Drought and management of drought. Use of weather data for scheduling irrigation. Weather effects on pest and disease incidence. Wind and windbreaks.