Step 1: Question Overview:
The question requires identifying the 1997 international agreement setting emission reduction targets for industrialized nations.
Step 2: Protocol Breakdown:
Kyoto, Japan (1997): The Kyoto Protocol, adopted in Kyoto, Japan, on 11 December 1997, extended the 1992 UNFCCC. It obligated industrialized countries and economies in transition to limit greenhouse gas (GHG) emissions based on set targets. This is the correct answer.
Montreal, Canada (1987): The Montreal Protocol focused on protecting the ozone layer by phasing out ozone-depleting substances, not greenhouse gases.
Doha, Qatar (2012): The Doha Amendment (2012) extended the Kyoto Protocol's lifespan until 2020; it was not the initial agreement.
Paris, France (2015): The Paris Agreement (2015) aims to limit global warming to under 2 degrees Celsius (ideally 1.5 degrees Celsius) compared to pre-industrial levels; it succeeded the Kyoto Protocol, but was signed later than 1997.
Step 3: Conclusion:
The 1997 UN agreement to curb greenhouse gas emissions originated in Kyoto, Japan.