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Solar pasteurization system is used to kill harmful bacteria present in the raw milk. It is carried out in dairy industries with the help of boiler and using wood or coal for heating of the milk. Due to the increment of global warming and its harmful effects, coal or wood should not be used for milk pasteurization system. Hence, researchers have started work on renewable energy source like solar energy for pasteurization system. Many scientists from all around the world have attempted to use solar energy for milk pasteurization system. The present review paper shows the research works carried out by researchers on milk pasteurization system. After several reviews, it has been found that solar energy is the best solution for milk pasteurization system.

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Rice (Oriza sativa L.) is the major cultivated crops of India with 43.38 million hectares (M ha) area and 104.32 million tons (Mt) production. It is the single largest user of fresh water that consumes about 30% and more than 45% of fresh water in world and Asia respectively (Barker et al., 1999). It accounts for more than 40% of the food grain production, providing direct employment to 70% people in Indian rural areas. Being a staple food for more than 65% of the people, our national food security relies on the growth and stability of rice production. Traditional rice cultivation requires continuous irrigation or flooding that raises the question on the availability of water in future. Thus, it is very crucial to adopt a low water utilizing approach that can produce enough to meet the food demands of increasing population without hampering the water availability in the long run.Aerobic rice is projected as sustainable rice production system for the immediate future to address water scarcity, soil health and environmental safety in the scenario of global warming (Basha and Basavarajappa, 2016). International Rice Research Institute developed the "aerobic rice technology" to address the water crisis in tropical countries.

The potential application of high temperature solar heat for the production of synthesis gas from char has been investigated. Indirect transfer of solar heat, simulated by an electric furnace, to a bench scale fluidized bed reactor has been examined, the fluidizing gas being the heat carrying medium. The solar heat requirements for the gasification of char have been determined at different gasification temperatures. The effect of temperature on the gasification rate and the heating value of gas have also been studied. The gasification of char using solar energy has been found to be technically feasible.