Anthropogenic Effects of Climate Change

🔥 1. The Big Picture (VERY IMPORTANT)

Earth as a System

  • Earth = one connected system
    (atmosphere + oceans + land + living things)

  • Everything affects everything else

  • Controlled by feedback loops

Anthropocene

  • Current era dominated by human impact

  • Started around the Industrial Revolution (~1700s)

  • Humans now change:

    • Climate

    • Land

    • Water

    • Biodiversity

👉 Exam tip:
If they ask “why is the Anthropocene important?” →
➡ Humans are now the main force shaping Earth

⚡ 2. The Great Acceleration

  • Rapid changes after 1950

  • Caused by:

    • Population growth

    • Technology

    • Resource use

Key idea:

  • Humans are using more resources, faster than ever

🌱 3. Tragedy of the Commons

  • Shared resources get destroyed when people act selfishly

Examples:

  • Overfishing

  • Pollution

  • Air & water use

👉 Simple memory trick:
“Shared = destroyed if unmanaged”

🏭 4. Industrial Revolution Impacts

  • Shift to machines & factories

  • Increased:

    • Pollution

    • Resource extraction

    • Urbanization

Result:

➡ Environmental damage + climate change beginnings

🌾 5. Dust Bowl (IMPORTANT EXAMPLE)

  • 1925–1936

  • Caused by:

    • Drought (natural)

    • Bad farming (human)

Result:

  • Soil loss

  • Crop failure

  • Starvation

👉 Exam tip:
Shows how humans + nature together cause disasters

🌿 6. Conservation Ethics (KNOW DIFFERENCES)

1. Romantic-Transcendental

  • Nature = sacred

  • Preserve it

  • Key people:

    • John Muir

    • Henry David Thoreau

2. Resource Conservation

  • Use nature wisely

  • For human benefit

  • Key person:

    • Gifford Pinchot

3. Land Ethic

  • Humans are part of ecosystem

  • Protect whole system

  • Key person:

    • Aldo Leopold

👉 Quick memory:

  • Muir = preserve

  • Pinchot = use

  • Leopold = balance

🐺 7. Keystone Species Example (Wolves)

  • Wolves removed → ecosystem broke

  • Wolves added back → ecosystem recovered

👉 Key term:

  • Keystone species = species that controls ecosystem

🌡 8. Climate Change Basics (VERY TESTED)

Definition:

  • Change in Earth’s climate over time

  • Earth is now warmer and more unpredictable

☀ 9. Greenhouse Effect

  • Heat gets trapped by gases

Main gases:

  • CO₂

  • CH₄

  • N₂O

👉 Important:

  • Greenhouse effect = GOOD (keeps Earth warm)

  • Too much = BAD (warming)

🌍 10. CO₂ = Earth’s Thermostat

  • More CO₂ → warmer planet

  • Less CO₂ → cooler planet

Current level:

  • ~429 ppm (very high)

🔁 11. Feedback Loops

Positive feedback (BAD)

  • Makes change worse
    Example:

  • Ice melts → more heat absorbed → more melting

Negative feedback (GOOD)

  • Stabilizes system
    Example:

  • Weathering removes CO₂

⛽ 12. Fossil Fuels Problem

  • Burning oil/coal releases stored carbon

  • Adds CO₂ quickly → warming

👉 Key idea:

  • Humans sped up natural carbon cycle

📈 13. Evidence of Climate Change

Hockey Stick Curve

  • Sudden temp increase

Keeling Curve

  • CO₂ rising since 1958

👉 Important:

  • It’s not just high CO₂

  • It’s how FAST it increased

🔮 14. Future Predictions

  • +1.5°C to +5°C by 2100

  • Depends on human actions

🚨 15. Climate Change Effects (BIG SECTION)

🌊 Sea Ice Loss

  • Arctic melting rapidly

  • Causes:

    • Habitat loss

    • More warming (less reflection)

🌊 Sea Level Rise

  • ~4 mm/year globally

  • Louisiana: ~9 mm/year

Causes:

  • Thermal expansion (water expands when warm)

  • Melting glaciers

🌪 Extreme Events

More:

  • Heat waves

  • Floods

  • Droughts

  • Storms

🌆 16. Heat Island Effect

  • Cities are hotter than rural areas

Why:

  • Buildings trap heat

  • Less plants

  • Dark surfaces absorb heat

👉 Can be 10°C hotter

🌧 17. Extreme Weather Chain

  • Heat ↑ → evaporation ↑ → rainfall ↑

  • Leads to:

    • Flooding

    • Stronger storms

🧠 HOW TO STUDY THIS FAST

Step 1: Focus on THESE (most tested)

  • Anthropocene

  • Greenhouse effect

  • CO₂ thermostat

  • Feedback loops

  • Tragedy of commons

  • Conservation ethics

  • Climate impacts (sea level, storms)

Step 2: Use this memory trick:

“Humans → CO₂ → Warming → Effects”

Step 3: Practice Questions (try these)

  1. What is the Anthropocene?

  2. Difference between positive vs negative feedback?

  3. Why is CO₂ called a thermostat?

  4. What causes sea level rise?

  5. Explain tragedy of the commons

  6. Compare Muir vs Pinchot vs Leopold