2013 United Nations Climate Change Conference
In November 2013, Poland hosted COP19, the United Nations Climate Change Conference in Warsaw. Over 10,000 delegates from 189 countries convened to address the escalating climate crisis, aiming to limit global warming to 2 degrees Celsius and set the stage for the 2015 Paris Agreement.
Source: Wikipedia — 2013 United Nations Climate Change Conference (CC BY-SA 4.0)