Climate Change & Agreements

Melting Arctic sea ice does not raise global sea level. Why not?

1. Sea ice floats, and a floating body displaces a volume of water equal to its own weight.
2. When it melts, the meltwater occupies exactly the volume it was already displacing.
3. Land ice is different: ice on Greenland, Antarctica and mountain glaciers is not currently in the ocean, so its melting adds water and does raise sea level, as does thermal expansion of warming water.

Answer: Because floating ice already displaces its own weight; only land ice and thermal expansion raise sea level.

How does the Paris Agreement differ in kind from the Kyoto Protocol?

1. Kyoto imposed legally binding targets, negotiated internationally, on Annex I developed countries alone — a top-down design.
2. Paris applies to all parties, and each sets its own Nationally Determined Contribution — a bottom-up design.
3. Under Paris the obligation is procedural: to submit, maintain and progressively strengthen a contribution, not to achieve any specific number.

Answer: Kyoto was top-down and applied to some countries; Paris is bottom-up and applies to all.

India's NDC promises a 45 per cent reduction in emissions intensity by 2030. Can its emissions still rise?

1. Emissions intensity is emissions per unit of GDP, not total emissions.
2. If GDP grows faster than emissions, intensity falls even while absolute emissions increase.
3. The target is therefore compatible with rising emissions, which is the point of framing it that way for a developing economy.

Answer: Yes — it is an intensity target, not an absolute cap.

India's target was 50 per cent non-fossil installed capacity by 2030. Where does that stand?

1. The commitment was announced at COP26 in 2021 and formalised in the updated NDC of August 2022.
2. In July 2025 India announced that non-fossil sources had reached fifty per cent of installed capacity — five years early, at a total installed capacity of about 485 gigawatts.
3. The remaining challenge is generation rather than capacity, because solar and wind have lower capacity factors, so their share of electricity actually produced is smaller.

Answer: Achieved in July 2025, five years ahead of schedule.

What is loss and damage, and why is it a separate pillar?

1. Mitigation reduces emissions and adaptation adjusts to changes that will occur anyway.
2. Some harm — land lost to sea level rise, destroyed cultural heritage, a state made uninhabitable — cannot be adapted to at all.
3. Developing countries argued that adaptation finance does not answer for such irreversible losses, so a distinct fund was agreed at COP27 and operationalised at COP28.

Answer: It is harm that neither mitigation nor adaptation prevents, and it now has its own fund.

Why does methane matter differently from carbon dioxide?

1. Methane has a far higher global warming potential per unit mass than carbon dioxide over a hundred years.
2. But it breaks down in the atmosphere in roughly a decade, whereas carbon dioxide persists for centuries.
3. So cutting methane produces rapid temperature benefit, while cutting carbon dioxide is what determines the long-run outcome — which is why policy treats them differently rather than simply adding them together.

Answer: Methane traps more heat but is short-lived; carbon dioxide traps less but lasts far longer.

Where was COP30 held, and what was agreed?

1. The thirtieth Conference of the Parties was held at Belém in Brazil in November 2025, concluding after overtime negotiations.
2. It agreed to mobilise 1.3 trillion dollars a year by 2035, to double adaptation finance by 2025 and triple it by 2035, and to set replenishment cycles for the loss and damage fund.
3. It also launched a Global Implementation Accelerator, a Belém Mission to 1.5 °C, and a Just Transition Mechanism.

Answer: Belém, Brazil, November 2025 — chiefly a finance and implementation outcome.

Why is India's target framed as "non-fossil" rather than "renewable"?

1. Renewable sources are those naturally replenished — solar, wind, hydro, biomass, geothermal, tidal.
2. Nuclear power is not renewable, because uranium is a finite resource, but it emits almost no carbon dioxide in operation.
3. Framing the target as non-fossil allows nuclear and large hydro to count towards it, which is why the categories must be kept distinct in an answer.

Answer: Because "non-fossil" includes nuclear and large hydro, which "renewable" may not.