As India progresses fast in the 21st century, we also face daunting challenges of energy security and climate change. Tremendous development in various sectors like industry, agriculture, transport has resulted in huge rise in demand for energy. Fulfilling these demands through conventional fossil fuel based energy generation has given rise to significant emissions (both gaseous and liquids) that have caused pollution to atmosphere and aquatic eco-systems. Use of sustainable and green (or renewable) resources and technologies offers a viable and promising solutions to these issues. Last two...