Question 1

What is a climate tipping point?

Accepted Answer

A **tipping point** is a threshold beyond which a component of the climate system shifts to a **qualitatively different state**, and continues doing so under its own momentum even if the original forcing stops.

**The defining features:**

**Self-sustaining change.** Past the threshold, feedbacks drive the transition forward without further external push.

**Difficult or impossible to reverse** on human timescales — **hysteresis** means returning temperatures to previous levels does not return the system to its previous state.

**Disproportionate response.** A small additional change produces a large outcome, which breaks the intuition that impacts scale smoothly with warming.

**The elements most commonly identified:**

**Greenland and West Antarctic ice sheets.** As an ice sheet thins, its surface descends to warmer altitudes, accelerating melt — a self-reinforcing loop. Committed sea level rise from either is measured in metres over centuries.

**Permafrost thaw**, releasing stored carbon and methane, which causes further warming and further thaw.

**Amazon dieback.** The forest generates much of its own rainfall through transpiration. Beyond a threshold of deforestation and drought, that recycling weakens and parts of the forest could transition toward savanna — converting a carbon sink into a source.

**The Atlantic overturning circulation (AMOC)**, which redistributes heat northward. Freshwater from ice melt reduces the density-driven sinking that drives it. A substantial weakening would alter European climate considerably.

**Coral reef die-off**, which is already occurring extensively.

**Boreal forest shifts** and **monsoon changes**.

**What the science does and does not say.** The existence of these mechanisms is well established. **The thresholds are uncertain** — estimates span wide temperature ranges, and for several elements it is unclear whether a genuine tipping point exists or whether change is gradual. Timescales also differ enormously, from years for coral to millennia for ice sheets.

**Cascading effects** — one triggering another — are hypothesised and less well constrained.

**Why they dominate the framing.** Tipping points are the main reason the difference between 1.5°C and 2°C is argued to matter disproportionately.

Question 2

What is permafrost, and why does thawing matter?

Accepted Answer

Ground that has remained frozen for at least two consecutive years — covering roughly a quarter of the northern hemisphere's land — and its thaw matters because of what has been locked inside it for

Question 3

What are the main causes of climate change and how do they affect the environment?

Accepted Answer

Climate change is caused by human activities like burning fossil fuels, deforestation, and agriculture, leading to rising temperatures, extreme weather, and ocean acidification.

Question 4

Can a single weather event be blamed on climate change?

Accepted Answer

Increasingly yes, in a specific and quantified way — through a field called attribution science that did not meaningfully exist twenty years ago. Why the old answer was no. The standard line was that

Question 5

What is ocean acidification?

Accepted Answer

The fall in ocean pH caused by seawater absorbing carbon dioxide from the atmosphere — sometimes called "the other carbon problem", because it is a direct chemical consequence of emissions that has

Question 6

What is the difference between climate mitigation and adaptation?

Accepted Answer

Mitigation reduces the cause. Adaptation reduces the harm. Both are necessary, and treating them as alternatives is a mistake that has cost real time. Mitigation means limiting climate change itself

Question 7

What is a carbon offset and do they actually work?

Accepted Answer

A carbon offset is a credit representing one tonne of CO₂ either removed from the atmosphere or prevented from being emitted somewhere else, bought to compensate for emissions you produced. The types

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