NEDP Environmental Awareness 1 — Questions and Answers

Question 1: What is the greenhouse effect?

The trapping of heat by gases in the atmosphere, warming Earth's surface (Correct answer)
The cooling effect of greenhouse plants on the environment
A phenomenon that occurs only in tropical climates
The process by which plants absorb sunlight for photosynthesis

Correct answer: The trapping of heat by gases in the atmosphere, warming Earth's surface

Greenhouse gases (CO₂, methane) trap solar heat in the atmosphere, keeping Earth warm — but excess gases intensify this, causing climate change.

The greenhouse effect is a natural process: sunlight warms Earth's surface, which radiates heat as infrared radiation. Greenhouse gases (CO₂, water vapor, methane, nitrous oxide) in the atmosphere absorb and re-emit this heat, preventing it from escaping into space. Human activities have increased greenhouse gas concentrations, enhancing this effect and driving global temperature rise.

Question 2: Which of the following is an example of a renewable energy source?

Solar power (Correct answer)
Natural gas
Coal
Nuclear energy

Correct answer: Solar power

Solar power is renewable because the sun's energy is replenished naturally and will not run out on human timescales.

Renewable energy sources are naturally replenished on human timescales: solar, wind, hydroelectric, geothermal, and biomass. Coal and natural gas are fossil fuels — finite resources formed over millions of years. Nuclear energy uses uranium, a finite mined resource, making it non-renewable, though it produces minimal carbon emissions during operation.

Question 3: What does 'biodiversity' mean?

The variety of living species in a given ecosystem or on Earth as a whole (Correct answer)
The ability of soil to support crop growth
The number of different minerals found in a region
The process of adapting to different climates

Correct answer: The variety of living species in a given ecosystem or on Earth as a whole

Biodiversity refers to the variety of life — species diversity, genetic diversity, and ecosystem diversity — which supports ecological stability.

Biodiversity encompasses three levels: genetic diversity (variation within species), species diversity (number and variety of species), and ecosystem diversity (variety of habitats). High biodiversity increases ecosystem resilience, supports food webs, provides medicines, and ensures ecosystem services like clean water and air. Habitat destruction and climate change are leading causes of biodiversity loss.

Question 4: What is the correct recycling hierarchy, from most to least preferred option?

Reduce, Reuse, Recycle (Correct answer)
Recycle, Reduce, Reuse
Reuse, Recycle, Reduce
Recycle, Reuse, Reduce

Correct answer: Reduce, Reuse, Recycle

The '3 Rs' hierarchy prioritizes reducing consumption first, then reusing items, and recycling only as a last resort — all better than landfill.

The waste management hierarchy (Reduce, Reuse, Recycle) ranks strategies by environmental impact. Reducing consumption prevents waste from being created at all — the most impactful step. Reusing extends the life of products. Recycling converts waste into new materials but requires energy. All three are preferred over landfill disposal or incineration.

Question 5: What is 'deforestation' and why is it an environmental concern?

The large-scale removal of forests, which reduces carbon absorption, destroys habitats, and contributes to climate change (Correct answer)
The practice of planting trees in urban areas to reduce pollution
A natural process by which forests thin out over winter
The controlled burning of forests to create agricultural land in a sustainable way

Correct answer: The large-scale removal of forests, which reduces carbon absorption, destroys habitats, and contributes to climate change

Deforestation removes trees that absorb CO₂, displaces wildlife, erodes soil, and disrupts water cycles, contributing to climate change.

Deforestation involves permanently removing forest cover, mainly for agriculture, logging, and urban development. Trees absorb CO₂ (a major greenhouse gas), and their removal both releases stored carbon and reduces the planet's capacity to absorb future emissions. Deforestation also destroys habitats for millions of species, causes soil erosion, and disrupts water cycles.

Question 6: What is a 'carbon footprint'?

The total amount of greenhouse gases produced by an individual, organization, or activity (Correct answer)
The physical area of land burned by carbon fuels
The amount of carbon stored in a forest ecosystem
A measurement of air pollution visible in cities

Correct answer: The total amount of greenhouse gases produced by an individual, organization, or activity

A carbon footprint measures total greenhouse gas emissions (in CO₂ equivalent) from all activities — transportation, energy use, food, etc.

A carbon footprint quantifies all greenhouse gas emissions — CO₂, methane, nitrous oxide — from an individual's or organization's activities, converted to CO₂ equivalents. Major contributors include vehicle use, air travel, home energy consumption, and diet (especially meat-heavy). Reducing your carbon footprint involves choices like using public transit, eating less meat, and improving home energy efficiency.

NEDP Environmental Awareness 1

What is the greenhouse effect?