Okay kiddo, let me explain to you what an environmental performance index (EPI) is.
Imagine that planet Earth is like your bedroom, and you want to keep your bedroom clean and tidy. The EPI is like a report card that grades countries around the world on how well they are keeping their environment clean and tidy, just like how your parents might give you a report card on how well you're keeping your room organized.
The EPI looks at lots of different things to decide how well a country is doing. It grades countries based on how clean the air and water are, how much pollution they produce, how much waste they generate, and how much energy they use. Just like how your parents may give you rewards for doing a good job cleaning your room, countries that score high on the EPI are rewarded with things like better health and happier citizens.
So, just like you should take good care of your bedroom, countries should also do their best to take care of the environment. The EPI helps us keep track of how well countries are doing so that we can work together to make sure that our planet stays healthy and clean for all of us!