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Climate science is the physics of air, water, ice and sunlight, written in maths and run on computers. If you want to work on the monsoon, heatwaves or melting glaciers, the route starts with subjects you already study in Class 11 and 12.
What subjects do you need to become a climate scientist?
Physics and maths come first. The atmosphere and ocean are moving fluids heated by the Sun, so the work rests on a few school topics taken much further:
Thermodynamics and radiation: how heat moves, why air cools as it rises, how sunlight in balances heat out.
Fluid mechanics and waves: winds, ocean currents and monsoon circulation are fluid flow on a rotating planet.
Calculus and differential equations: every climate model is a large set of equations stepped forward in time.
Statistics: trends, extremes and uncertainty in long, messy records of rainfall and temperature.
Programming: most daily work is code. IITM Pune's website lists its high-performance computing systems, Pratyush and Aaditya, alongside its weather and climate prediction systems.
Earth science and chemistry matter too, especially for glaciers, past climates or air quality. The IISc Centre for Atmospheric and Oceanic Sciences encourages graduates in engineering and the physical sciences to apply, which is the pattern across the field: people arrive from physics, maths or engineering and learn the climate-specific parts in a master's or PhD.
What does a climate scientist actually do?
"Climate scientist" covers several jobs:
Modeller: builds and tests computer models of the atmosphere and ocean.
Observational or field scientist: measures the real system. The National Centre for Polar and Ocean Research in Goa, under the Ministry of Earth Sciences, studies the polar regions and the Southern Ocean.
Data scientist: finds signals such as heatwave trends or monsoon shifts in satellite and station records.
Paleoclimate researcher: reads past climates from rocks, sediments and ice.
Forecaster: turns the physics into daily and seasonal warnings. Our guide to becoming a meteorologist in India covers the IMD route.
Try the first calculation in climate science
This worked example shows the kind of physics the field runs on, using numbers from NASA's Earth fact sheet.
Sunlight reaching Earth carries 1361 W/m² (NASA).
Earth's Bond albedo is 0.294, so about 29% is reflected straight back (NASA).
Earth intercepts sunlight on a disc but radiates from a whole sphere, four times the area. Absorbed power per square metre is 1361 × (1 − 0.294) ÷ 4 ≈ 240 W/m².
In balance, Earth radiates that much as a black body: σT⁴ = 240 W/m², with σ = 5.670374419 × 10⁻⁸ W m⁻² K⁻⁴ (NIST).
Solve: T ≈ 255 K, about −18 °C. NASA lists Earth's black-body temperature as 254 K.
NASA gives Earth's average temperature as 288 K. The gap of about 33 K is the greenhouse effect.
We walk through this estimate in more detail in estimating Earth's temperature from radiation balance. If radiation or thermodynamics feels shaky, the Fermi Concept Library has a lesson for each concept in physics and mathematics, so you can fill one gap at a time.
Which institutes in India do climate research?
IITM Pune: an autonomous institute of the Ministry of Earth Sciences, with a Centre for Climate Change Research and a Monsoon Mission. It has called for PhD admissions through AcSIR (IITM).
NCPOR Goa: polar, ocean and cryosphere research (NCPOR).
IISc Bengaluru, CAOS: atmosphere, ocean and climate research, with MTech and PhD programmes; passing a national exam such as GATE or CSIR/UGC JRF is needed to be called for interview (CAOS).
IIT Delhi, Centre for Atmospheric Sciences: an MTech in Atmospheric-Oceanic Science and Technology (CAS IIT Delhi).
IISER Pune, Earth and Climate Science: research on climate modelling, monsoon dynamics, tropical convection, glaciers and rivers, with a PhD in Earth and Climate Science (IISER Pune).
Which route should you take after Class 12?
Check each institute's current page before applying; rules change yearly.
Class 11-12: take PCM and treat thermodynamics, waves and calculus as core. For an early taste, try the Earth Science Olympiad in India.
Undergraduate: a BSc in physics or maths, a BS-MS at an IISER, or a BTech in a branch such as civil, mechanical or chemical.
Keep physics and maths together. IIT Delhi's atmospheric MTech accepts MSc holders only if they studied both in their BSc (CAS IIT Delhi).
Master's: that MTech accepts GATE scores in papers including Physics, Mathematics, Geology and Geophysics, and several engineering papers.
PhD: research scientist posts usually need one. The joint CSIR-UGC NET, conducted by NTA, includes an Earth, Atmospheric, Ocean and Planetary Sciences subject; in April 2026 CSIR-HRDG put a proposed revised syllabus for it out for feedback (CSIR-HRDG notice).
If you are not sure where to start with the maths, Fermi's AI tutor can work out what you already know and build a plan for the session, so each sitting has a clear next step.
