Future climate: projections, impacts on environments, tipping points

Think of the Representative Concentration Pathways (RCPs) like different speed limits for the planet’s thermostat. They show how much greenhouse gases we might emit and how hot the Earth could get.

The higher the RCP, the more we’re “letting the thermostat stay on high.”

Imagine the Earth as a garden. Warming is like a sun that keeps getting stronger, making the soil dry and the plants stressed.

• Sea level rise: +0.3–1.0 m by 2100 🌊
• More frequent heatwaves 🌡️
• Intensified tropical cyclones ⚡
• Loss of Arctic sea ice ❄️
• Coral bleaching and reef collapse 🐠
• Shifts in biomes and species ranges 🌿

Exam tip: Cite specific examples (e.g., coral bleaching in the Great Barrier Reef) and link them to the projected temperature rise.

Tipping points are thresholds that, once crossed, trigger rapid, often irreversible change. Think of a dam that, once the water level rises past a certain point, bursts.

1. Greenland ice sheet melt → sea level rise.
2. Amazon rainforest dieback → loss of carbon sink.
3. West African monsoon collapse → drought in Sahel.
4. Methane clathrate release → positive feedback.
5. Permafrost thaw → CO₂ and CH₄ emissions.

Mathematically, a tipping point can be represented as a critical threshold: $ΔT > 1.5°C$ may trigger the Greenland melt.

Exam tip: Explain the mechanism behind each tipping point and discuss potential consequences for human societies.

Governance is like a school council that sets rules for everyone. Key agreements include the Paris Agreement, UNFCCC, and IPCC reports.

• Renewable energy: solar, wind, hydro 🌞🌬️
• Carbon pricing: carbon tax, cap‑and‑trade 💰
• Reforestation & afforestation 🌳
• Energy efficiency in buildings 🏠
• Urban green infrastructure 🏙️

Exam tip: Discuss both mitigation (reducing emissions) and adaptation (preparing for impacts).

When answering, use the “explain” keyword to show depth of understanding.

Checklist: Define terms, give examples, discuss impacts, mention governance, and use relevant data (e.g., RCP tables).

Keep your answer tidy: 10 min per paragraph, use bullet points where appropriate, and finish with a concise conclusion.