These models serve as important warning systems for impending climate changes
1. RCP 2.6 (Low Emissions Scenario)
This scenario assumes that greenhouse gas emissions are reduced very rapidly and drastically. It requires a global shift to renewable energy and technologies for CO₂ removal. If successful, global warming could stay below 2°C by 2100, significantly mitigating the impacts of climate change.
2. RCP 4.5 (Intermediate Scenario)
Here, emissions rise until around 2040 and then gradually decline. This scenario envisions moderate climate protection measures, leading to warming between 2.4–3.2°C by the end of the century. The changes are noticeable but not as extreme as in the highest emission scenarios.
3. RCP 6.0 (Medium Emissions Scenario)
This scenario assumes that emissions will only stabilize towards the end of the century. Without significant climate action, the Earth could warm by 3–3.7°C. The risks for ecosystems, extreme weather, and sea level rise would be substantial.
4. RCP 8.5 (Business-as-usual Scenario)
The “worst-case scenario” describes a world where emissions continue to increase until 2100. This would result in warming of over 4°C, with catastrophic consequences for life on Earth. Extreme heat, frequent natural disasters, and massive species extinction would be the outcomes.
5. SSP1-1.9 (Sustainability Pathway)
This scenario is the most ambitious, aiming to limit warming to 1.5°C. It requires global cooperation, clean energy, and sustainable economic systems. The challenge is immense, but the benefits for the planet would be significant.
6. SSP2-4.5 (Middle-of-the-Road Scenario)
Here, the world follows a mixed path, with some effective but also some insufficient climate measures. Warming would be between 2.6–3.2°C, posing dangerous impacts. The world would still face major environmental challenges, but some regions could cope better.
7. SSP5-8.5 (High Emissions Scenario)
In this scenario, the world heavily relies on fossil fuels and prioritizes economic growth without climate action. This leads to warming of more than 5°C, causing catastrophic changes to the global climate. This path would devastate many human livelihoods and most ecosystems.
Explanation: RCP (Representative Concentration Pathways) describe possible trajectories of greenhouse gas concentrations in the atmosphere. SSP (Shared Socioeconomic Pathways) complement these by outlining various social and economic developments that could influence climate change.