Final answer:
The 2015 United Nations Climate Change Conference in Paris aimed to achieve a global consensus on climate change action, resulting in the Paris Agreement, which set significant limits on CO2 emissions and aimed to keep global temperature rise well below 2°C above pre-industrial levels.
Step-by-step explanation:
The main objective of the 2015 United Nations Climate Change Conference (COP 21 or CMP 11), held in Paris, was to achieve a global consensus on climate action. This was encapsulated in the Paris Agreement, which aimed to strengthen the global response to the threat of climate change by keeping a global temperature rise this century well below 2 degrees Celsius above pre-industrial levels and pursuing efforts to limit the temperature increase even further to 1.5 degrees Celsius. The correct answer to the question is option C) Global consensus on climate change action.
The conference represented a pivotal moment in international climate diplomacy, with 195 countries agreeing to set a goal to limit global warming to less than 2°C higher than pre-industrial levels, and called for zero net anthropogenic greenhouse gas emissions to be reached during the second half of the 21st century. The agreement set out a framework for limiting CO₂ emissions significantly. It was a landmark accord that committed almost every nation to reducing greenhouse gas emissions, a testament to the urgency and unity required to tackle the global climate crisis.