Environment and ecology¶
One preparation shared by UPSC CSE, UPSC IFoS, UPPSC PCS and ESE aspirants. The overlap map lists every exam that counts it.
What it covers¶
- Ecology basics: ecosystems, biomes, biodiversity and its conservation. CSE Prelims asks "General issues on Environmental ecology, Bio-diversity and Climate Change - that do not require subject specialization".
- Pollution and climate change: environmental pollution and degradation, climate change causes and responses.
- Impact assessment and sustainability: conservation, environmental impact assessment, sustainable development (CSE Mains GS III; ESE Paper I item 6).
- Laws, protected areas and conventions: the Environment (Protection) Act, the protected-area network, the Convention on Biological Diversity and related global initiatives (CSE Botany optional, Ecology section).
- Energy and conservation: basics of energy and conservation of resources (ESE Paper I item 6: "Basics of Energy and Environment: Conservation, environmental pollution and degradation, Climate Change, Environmental impact assessment").
Depth by exam family¶
| Family | What the exam rewards |
|---|---|
| UPSC CSE | Generalist breadth: Prelims GS I plus Mains GS III (conservation, pollution, EIA); science optionals go deeper |
| UPSC IFoS | Deepest: shares the CSE Prelims screen (environment and biodiversity), then Forestry/Botany optionals at Mains |
| State PSC (UPPSC PCS) | CSE-style general studies plus state-specific protected areas and schemes |
| ESE Paper I | Shallow: one of ten GS areas, at engineering-graduate level without special study |
Official syllabi it follows¶
- ESE 2026 notification, Notice No. 02/2026-ENGG, Prelims Paper I syllabus: https://www.upsc.gov.in/sites/default/files/Notif-ESEP-26-Engl.pdf
- CSE 2026 notification, Notice No. 05/2026-CSE, Prelims GS I / Mains GS III / Botany optional syllabi: https://www.upsc.gov.in/sites/default/files/Notif-CSP-2026-Engl-060226Rev.pdf
Free resources¶
- Ministry of Environment, Forest and Climate Change (policies, reports, conventions): https://moef.gov.in
- NCERT textbooks (Class 12 Biology ecology units; Class 11–12 geography): https://ncert.nic.in/textbook.php
- NPTEL video courses on ecology and environment (IIT/IISc faculty): https://nptel.ac.in
- Press Information Bureau (new schemes, reports, convention updates): https://pib.gov.in
How to practise¶
Learn the static base from NCERT once, then keep one page of monthly current affairs (new protected areas, reports, conventions) from MoEF and PIB. Solve your target exam's official previous papers topic by topic.