Environment & Ecology Notes for UPSC

Biodiversity, ecosystems, climate change, conservation and environmental governance.

Finished revising? Test yourself on the 353 Environment previous year questions — every one with a worked explanation.

Aquatic Ecosystems: Classification, Issues, Conservation & CoralsClassification of aquatic ecosystems based on salt content (parts per thousand – ppt)
BIODIVERSITYBiodiversity is defined as ‘the variability among living organisms from all sources, including terrestrial, marine and other aquatic ecosystems and the ecological complexes of which they are a part; this includes diversity within species, between species and of ecosystems’ – United Nations Earth Summit (1992).
Biodiversity Conservation in India: Protected Areas, Biosphere Reserve, National ParkProtected areas are those in which human occupation or at least the exploitation of resources is limited. With only 2.
Biogeochemical Cycles: Types, Functions, And SignificanceA constant interaction between the biotic and abiotic components of the biosphere makes it a dynamic, but stable system. These interactions consist of a transfer of matter and energy between the different components of the biosphere.
Carbon Cycle: Exploration of Processes, Forms, and Environmental ImpactsThe carbon cycle is a complex and interconnected process that influences Earth’s climate, sustains life, and has implications for the well-being of ecosystems and human societies. In the composition of living organisms, carbon constitutes 49 per cent of dry weight of organisms and is next only to water.
Climate Change & Mitigation Strategies: Global Warming, Greenhouse GasesCarbon sequestration is a process to capture and store CO2 to curb global warming. It is captured from the air, industries or power stations and stored permanently underground.
Climate Change In India: Actions, Policies, and InitiativesNational Mission for Enhanced Energy Efficiency (NMEEE): A initiative to control Climate Change In India
Climate Change Organizations: Exploring Global Initiatives for Environmental SustainabilityClimate Change Organizations: Exploring Global Initiatives for Environmental Sustainability
Coniferous Forests: Characteristics, Types, Economic SignificanceIn this article we are Discovering the attractive world of coniferous forests in our in-depth guide. Exploring their unique characteristics, rich biodiversity, and the critical role they play in our global environment.
Conservation Measures: Modes, Protected Areas, Action Plans, and InitiativesCONSERVATION MEASURES: BIODIVERSITY CONSERVATION & RURAL LIVELIHOOD IMPROVEMENT PROJECT (BCRLIP)
Ecological Pyramids: Trophic Levels, Types & Energy Dynamics in EcosystemsEcological pyramids are graphical representations used in ecology to illustrate the relationships between different trophic levels within an ecosystem. Charles Elton, a leading British ecologist, was the one to originally present the idea of an ecological pyramid.
ECOLOGY, ECOSYSTEM AND FUNCTIONS OF ECOSYSTEMAn abiotic factor is a non-living part of an ecosystem that shapes its environment. In a terrestrial ecosystem, examples might include temperature, light, and water.
Ecosystem Dynamics: Characteristic, Types Of Food Webs & Species InteractionsWith this article, we are, Discovering how animals help, hurt, or live side by side in nature’s neighbourhood, how food webs are connecting all living things in the great web of life.
Ecosystem: Components, Functions, Biotic Interactions, Biogeochemical CyclesAn abiotic factor is a non-living part of an ecosystem that shapes its environment. In a terrestrial ecosystem, examples might include temperature, light, and water.
Ecosystem: Components, Functions, Energy Flow & CycleAn ecosystem is a defined geographical area where plants, animals, and various organisms interact with the prevailing weather and landscape to create a self-contained sphere of life. The earth as a whole is a series of connected ecological systems where biotic and abiotic factors interact with each other to sustain li
Energy Flow in Ecosystem: Food Chain, Hierarchy, Significance & CharacteristicsEvery organism, ranging from single-celled algae to massive blue whales, requires sustenance for survival. Thus, each food chain represents a potential route through which nutrients and Energy Flow in Ecosystem.
Energy Flow In Ecosystem: Trophic Levels And Mode Of NutritionThe primary source of Energy Flow in Ecosystem comes from the sun. The energy from the sun transforms by plants into chemical energy through a process called photosynthesis.
ENVIRONMENTS. No.
Environment: Component, Human-Environment Relationship & Sustainable DevelopmentBroadly the environment comprises abiotic (non-living) and biotic (living) components.
Environmental Conventions and Protocols: Features, Importance, and ImplementationThe Rio Declaration consisted of 27 principles intended to guide countries in future sustainable development. It was signed by over 175 countries.
Environmental Laws in India: Definition, Legal Frameworks & Protection to BiodiversitySchedule II: Specifying the animal species with a relatively lower degree of protection.
Environmental Organizations In India: Biodiversity, Conservation, WelfareENVIRONMENTAL ORGANIZATIONS: NATIONAL PLAN FOR CONSERVATION OF AQUATIC ECO-SYSTEMS (NPCA)
Forest Ecosystem: Biodiversity, Types, & Crucial Roles in Environmental BalanceA forest ecosystem is a complex and interconnected community of plants, animals, microorganisms, and their physical environment within a forested area. They provide habitats for countless organisms, from tiny insects to large mammals, and support a diverse range of flora.
Grassland Ecosystems: Biodiversity, Conservation, And Economic SignificanceIn this article, we are Exploring the world of Grassland Ecosystems and will be Learning about their rich biodiversity, conservation efforts, and economic significance and Uncovering the vital role these ecosystems play in our environment and economy.
Human Environment Interaction: Components, Types, and Human Impact on EarthEach and every living organism has a specific surrounding or medium with which it continuously interacts, derives its sustenance and to which it is fully adapted. Thus, every individual in nature interacts with its environment, influences it and in turn is influenced by it.
Importance Of Forest: Guardians Of Biodiversity And Life’s EssentialsImportance of Forest: Functions – Production, Protection, and Regulation for a Balanced Environment
Pollution: Types and Impact on Health, E-Waste and BioremediationSoil pollution is the deterioration in quality & fertility of soil due to the presence of toxic pollutants.
Temperate Forests: Types, Ecological Significance, Cultural ValueTemperate forests are among the most diverse and vital ecosystems found in regions with moderate climates characterized by distinct seasons. These forests are marked by their seasonal variations, consisting of lush green canopies in the warm months and colorful displays of falling leaves in the autumn.
Terrestrial Ecosystem: Types, Tundra, Forest, Grassland & Desert EcosystemsA terrestrial ecosystem (TE) is a land-based community of organisms (biotic) and their interactions with the abiotic components in a given area.
Terrestrial Ecosystems: Types, Environmental Factors & Ecological SignificanceA terrestrial ecosystem is a distinct ecological community of organisms, both living and nonliving, that inhabit and interact within a land-based environment. These ecosystems encompass a vast range of terrestrial habitats, from lush forests and expansive grasslands to arid deserts and frozen tundras.
The Desert Ecosystem: Types, Adaptation, Biodiversity & ResilienceThe desert ecosystem is a fascinating ecosystem where life has evolved to thrive under the most stringent water conservation and temperature regulation mechanisms, making it a unique and resilient biome. Despite the challenging conditions, it is home to a remarkable array of specially adapted plant and animal species.
Tropical Rainforest: Nature’s Green Treasure & Economic SignificanceThe tropical rainforest is one of the Earth’s most diverse ecosystems, known for its lush vegetation, abundant wildlife, and vital role in maintaining the planet’s ecological balance. Scientists estimate that over 50% of the Earth’s plant and animal species are inhabited in tropical rainforests.
Tundra Ecosystem: Extreme Conditions, Adaptations, Characteristics, TypesThe tundra ecosystem is one of the Earth’s most extreme and challenging environments, characterized by its frigid temperatures, vast stretches of permafrost, and a short growing season. In these areas, the soil remains frozen year-round, and when the summer season arrives, the land covered in snow thaws, creating shal
Wildlife Conservation in India: Initiatives, Achievements & FutureNote: India became the 1st among the 13 tiger range countries to nationally adopt CA|TS.

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