Fossil fuels — coal, petroleum (oil), and natural gas — are not considered green energy sources because: (1) They are non-renewable (will run out); (2) Burning them releases CO₂ and other greenhouse gases that cause global warming and climate change; (3) They cause air, water, and soil pollution; (4) Their extraction damages ecosystems. Green energy (solar, wind, hydro) does not cause these problems.
Fossil fuels (coal, petroleum, natural gas) are NOT green — non-renewable and polluting.
They release CO₂ and other greenhouse gases → global warming and climate change.
Burning coal releases SO₂, NOₓ, PM2.5 → air pollution, acid rain, smog.
Oil spills and coal mining cause water and land pollution.
Estimated reserves: coal ~150 years; oil ~50–70 years; natural gas ~50 years.
Green energy (solar, wind, hydro) produces little or no pollution.
Fossil fuels account for 75%+ of global CO₂ emissions.
What Are Fossil Fuels? • Coal, petroleum (crude oil), and natural gas • Formed over millions of years from decomposed plant and animal matter • Burned to produce energy for electricity, transport, industry, heating
What is Green Energy? • Also called renewable or clean energy • Sources: solar, wind, hydroelectric, tidal, geothermal • Produces little or no pollution or greenhouse gases • Naturally replenished — will not run out
Why Fossil Fuels Are NOT Green — Reasons:
Non-Renewable — Will Run Out • Fossil fuels took millions of years to form — we are using them in centuries • Estimated reserves: coal ~100–150 years; oil ~50–70 years; gas ~50 years • Once used, cannot be replenished
Greenhouse Gas Emissions — Global Warming • Burning fossil fuels releases CO₂ (carbon dioxide), CH₄ (methane), N₂O (nitrous oxide) • These are greenhouse gases (GHGs) that trap heat in the atmosphere • Result: global warming → climate change, rising sea levels, extreme weather • Fossil fuel combustion = largest source of global CO₂ emissions (75%+)
Air Pollution • Burning coal releases: SO₂ (sulphur dioxide), NOₓ, particulate matter (PM2.5) • Causes smog, acid rain, respiratory diseases • Vehicle exhaust from petrol/diesel = major urban air pollution source
Water Pollution • Oil spills (tanker accidents, offshore drilling leaks) damage marine ecosystems • Coal mining drainage (acid mine drainage) contaminates rivers and groundwater
Land/Ecosystem Damage • Coal mines destroy forests and habitats • Open-cast (surface) mining degrades large land areas • Oil extraction may cause land subsidence and habitat destruction
Health Impacts • Air pollution from fossil fuels causes millions of premature deaths annually (WHO data) • Respiratory diseases, cardiovascular disease, cancer linked to fossil fuel pollution
Green vs Non-Green Energy Comparison:
| Feature | Fossil Fuels | Green Energy |
|---|---|---|
| Renewable | No | Yes |
| CO₂ Emissions | High | Negligible |
| Air Pollution | Yes | Minimal |
| Water Pollution | Risk | Low |
| Ecosystem Damage | Significant | Low |
| Depletion | Will run out | Inexhaustible |
NCERT Class 10 Context: • Chapter: Energy Sources (Science) / Sustainable Development (SST) • Fossil fuels vs renewable energy is a key exam topic • India's energy transition: push for solar (Surya Ghar Yojana), wind, and renewable energy to reduce fossil fuel dependence
Fossil fuels are not green because: (1) They are non-renewable — coal, oil, and gas took millions of years to form and will run out; (2) Burning them releases CO₂, CH₄, and other greenhouse gases that cause global warming; (3) They cause air pollution (SO₂, NOₓ, PM2.5), acid rain, and respiratory diseases; (4) Oil spills and coal mining damage water bodies and ecosystems. Green energy (solar, wind, hydro) is renewable and produces little or no pollution.
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