The first international convention to set targets for emissions of the main greenhouse gases was the:

Question

BlackTom AI · Accepted Answer

The Kyoto Protocol established legally binding emission reduction targets for specific greenhouse gases, so the correct answer is Kyoto Protocol.

Relevant knowledge points:
- The United Nations Framework Convention on Climate Change (UNFCCC, 1992) created the international framework but did not set quantitative, enforceable emission limits.
- The Kyoto Protocol (adopted in 1997, entered into force in 2005) was the first international agreement that assigned specific, legally binding emissions reduction commitments to developed (Annex I) countries.
- The Kyoto Protocol covered the main greenhouse gases: carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), hydrofluorocarbons (HFCs), perfluorocarbons (PFCs), and sulfur hexafluoride (SF6) (with later additions like NF3 added via amendment).
- The Paris Agreement (2015) introduced nationally determined contributions (NDCs) and a different, bottom-up approach; the UN Sustainable Development Goals (2015) are broad development goals including climate action but do not set binding emission targets.

Step-by-step reasoning:
1. Identify the candidate instruments: Paris Agreement, UN SDGs, Kyoto Protocol.
2. Compare their content and history: UNFCCC (1992) set the framework; the Kyoto Protocol (1997) was negotiated under the UNFCCC to set specific targets. It required Annex I countries to meet quantified targets during the first commitment period (2008–2012).
3. Note legal nature and timing: Kyoto’s commitments were legally binding for ratifying developed countries once it entered into force in 2005. Paris (2015) arrived later and uses voluntary/NDC mechanisms rather than the same binding, prescriptive targets. SDGs (2015) are normative development targets, not emissions treaties.
4. Conclude which was first: Kyoto (1997/2005) predates Paris and SDGs and is the first to set quantified greenhouse gas emission targets.

Why the other options are incorrect:
- Paris Agreement: key climate treaty but adopted in 2015 and relies on nationally determined contributions, not the first to set internationally agreed binding targets.
- United Nations Sustainable Development Goals: a set of 17 global goals adopted in 2015; they include climate action but do not establish formal emissions targets.

Therefore, the correct answer is: Kyoto Protocol.

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