Well, let's see.. I haven't seen one like this before. I'm usually in the Heart, but it makes me think.
We contribute spiritually, like Monks, the devout, through prayer, meditation and inspiration and service to uplift others. We contribute as philanthropists and humanitarians with aid and food programmes around the world.
We contribute to science and technology such as in medicine, electronics, space exploration; we contribute through nature and agriculture, such as farming, planting, growing food ...resevoirs for water, etc
We contribute to the marine industries such as fishing, wildlife and nature; we contribute in the family, growing children and instilling morals and etiquette.
We contribute through education through schools, colleges, universities; We contribute through religion via churches, stupors, mosques, Gurdhwaras ....to instill moral values, faith and hope in Something Higher. To help us grow and progress.
We contribute through architecture, planning, roads and environmental improvements. It goes on ...
We need cleaners, scavengers, health systems, political systems
One needs education, experience and knowledge, and a body of common sense attributable to the fact that we are humans with developed minds. Lots more.