So, did I answered on question what is sustainability and why humanity needs it.? I think yes. We need sustainability, we have to work, have to work hard, to save our planet, save Earth, because it is our home. We still need to introduce and invent new technologies which will help to humanity in the future with imminent problems what are comming, as population growing, problems with food, energy and environment. Evidence and facts shows, that is available sustainable engineering solutins, which can help solve many challenges of population growth and which is able to mitigate the effects of climate change. For example energy management technologies, such as smart meters and devices, which reducing heat loss by raising the buildings with better insulation and efficient termal use. There is necessary to have strong political and social will, to correct the market failure, to provide innovative financing mechanisms and new personal and community possession models and knowledge transfer of more cleaner technologies, better practices to ensure a better results through safer localization.…