Short on time before UPSC Prelims and struggling with tricky concepts? The exam increasingly tests your conceptual clarity and ability to apply core ideas, especially in the most dynamic subjects: Science, Economy, and Environment (SEE). UPSC Essentials’ new initiative, UPSC Prelims ‘SEE’ Snapshot, brings you, every Wednesday , a quick, exam-focused revision of key concepts. In each article, we pick three important current themes from Science, Economy, and Environment and decode them strictly through the Prelims lens—focusing on concepts and clarity. SCIENCE Sustainable Aviation Fuel Core Concept:  — SAF, also known as aviation biofuel, is a biofuel that is produced from sustainable feedstocks and has chemistry similar to conventional aviation turbine fuel or jet fuel, which is derived from crude oil.  — It is a ‘drop in’ fuel, meaning it can be blended with ATF without requiring any change in the existing machinery of aircraft.…