Why Major Economies are not Giving Attention to Climate Change?

In a G7 Meeting at Cornwell, Climate Change is the burning topic Leaders of the richest countries of the world have agreed on various theories and said to achieve the target of Net Zero Emissions by 2050. It will lead to change in the methods of working by the industries related to Fossil fuels. Recently, a report released by International Energy Agency and said that the Countries should ban Projects related to fossil fuels.