Why did COP 25 fail?

The reason for COP 25’s failure are as follows:

• At COP25, along with the diplomats, experts and activists there were also lobbyists representing the fossil-fuel industry, their presence would hamper any concrete discussion of reduction of emissions
  

• United States President Donal Trump announced that his country would be withdrawing from the Paris Agreement. Since the United States was one of the countries with high carbon emissions, it jeopardised the Paris Agreement.

• Protests all over the world over expensive living conditions, meant the Governments all over the world were reluctant to invest in a low-carbon future. 

For more relevant articles refer to the links given below:

• UPSC Environment and Ecology Questions
• Paris Agreement (COP21)
• UPSC Environment and Ecology