Sustainability is central/top/supreme idea of GG, Infact one of name of our organisation is "GGS-21c/3m Greater Good Sustainability Organisation of 21st Century or 3rd millennium"; GG name is obtained by combining two global-goals (GG) of united nations 1) millennium development goals 2000, 2) sustainable development goals 2015
Sustainability is defined differently by different peoples at different times, We mainly follow standard-definition given by united-nations's brundtland-commission in 1980s, it says,
"Sustainable development is development that meets the needs of the present without compromising the ability of future generations to meet their own needs."
We also follow sustainability as defined in "Better India, Better World" book by infosys founding CEO narayana murthy, page-287 of that book says,
"What are Infosys's contribution to India? Our greatest contribution is raising the confidence of young entreprenuers in this country. We have shown that it is possible to do business and create wealth legally & ethically, that sharing of wealth in a never-before manner is possible, that predictability, sustainability, profitability and de-risking are the cornerstones of corporate success"