YES aspires to discuss, act upon, and create awareness of a sustainable environment, ecological system and other related issues. It monitors the SICAS  recycling programme, carries out weekly cleanliness drives, and devises new methods to keep the environment clean. Each year it takes initiatives to plant trees with the help of the WWF and visits waste disposal sites with Waste Busters.

The society holds group discussions to brainstorm ideas regarding protection of the environment and arranges for talks by leading environmentalists. The society also arranges  internships with the WWF for the O’ Level and A1 classes.