This is a recall of what you had learned from your parents and at elementary school. Recycling is where you create a new product from paper, plastic, and glass. Reducing is where you minimize the amount of waste that you create. Reusing is using the item that is in good condition again without throwing it out. 

You should turn off the water after using it as it can cause wastewater to be thrown in the ocean and you don't want to destroy the sea animals habitat, right? Also, it could led in the future, water start to get limited and expensive, or eventually no more. So, you should use it wisely. 

Electricity such as light should be turned off after use. I mean we use electricity daily in our lives, at school, at home, or even outside, it's everywhere.  To save energy and resources as much as you can, you should also practice turning off the lights in the house after using them. 

Start planting tree and water the plants are a way to help the environmental as these trees is the one that provides us air. If you start do this, you'll pick a habit where soon or later, planting and take care of tree is your hobby. You can also plant your own vegetable in your backyard, so you can use it right away in fresh form instead go to the market. 

Sometimes, talking about sustainability within your family is a way to show them they also need to practice it, just like you. I mean no adult in the family wouldn't practice after you talk to them as they are supposed to be role models for you. You can also talk about sustainability within your social circle too. 

Before you practice sustainability, you need to always clean after yourself such as the toys you play with. If you want to do environmental sustainability, you first need to clean your surrounding and practice it before practicing other. Clean yourself will give you not leaving a mess and waste on the ground. And once you do it, you'll get use it that your parents don't remind you clean after yourself.