Mr. Tanay, environmental sciences integrates physical, biological and information sciences including ecology, biology, physics, chemistry, zoology, mineralogy,, oceanology, immunology, soil science, geology, atmospheric science, environmental engineering and geodesy. It finds the solution of all environmental problems. I think, at present two areas are very important and needs more information 1. Global climate change 2. Effect of nano-particles on environments (soil, air, water). You may choose any one of the topic.
Between having a background in Biotechnology and Environmental science, you have an uncountable number of “good” options, depending on your personal interests and motivations. Environmental Biotechnology related topic you may choose for your PhD.
Here are some topic related to Environmental Biotechnology
1. Components of Environment – Hydrosphere, lithosphere, atmosphere and biosphere – definitions with examples; Interaction of man and environment.
2. Global Environmental Problems – Green House Effect, Acid rain, El Nino, Ozone depletion, deforestation, desertification, salination, biodiversity loss; chemical and radiation hazards.
3. Environmental pollution and degradation – Pollution of air, water and land, noise pollution; environmental damage by agriculture, perspectives of pollution in urban, industrial and rural areas. Habitat Pollution by Chlorinated Hydrocarbons (DDT, PCBs, Dioxin etc), Organophosphates, Heavy Metals, Die-offs, Endocrine disrupting chemicals, Nutrient pollution.
4. Environmental Management – Health and sanitation, environmental diseases – infectious (water and air borne) and pollution related, health hazards due to pesticide and metal pollution, waste treatment, solid waste management, environmental standards and quality monitoring.
5. Environmental Protection Act – IUCN – role in environmental protection. Recent north-south debate on the priorities of implementation, Environmental Protection Agency (EPA).
6. Bioremediation – Oil spills, Wastewater treatment, chemical degradation, heavy Metals.