States have a common but differentiated responsibility because each state should work hard to combat climate change. The responsibility is differentiated because each state is emitting different amounts of pollution. A state with a higher population or higher amounts of factories will be making more pollution. But each state needs to work to clean up their act.
The countries that produce the most pollution are responsible for climate change, regardless of whether they are developed or not. The countries that produce the most pollution should be punished and held responsible the most. This is a fair and just way to deal with the environmental crisis. Innocent countries should not be penalized.