Sustainable CitiesIntroduction:A sustainable city is the one, which takes care of its current citizens and also the future ones. Sustainability itself means creating an environment socially and infrastructurally viable and without harming what our future generation receives from us. As is rightly said, we have not inherited this earth from our forefathers we have borrowed it from our future generation.And thereby the future belongs to those who create an environment that is worthliving today and tomorrow.To put that into perspective we have tried to put together some ideas and thoughts that could help current cities to move towards sustainability and some to create those.We have divided the city into various sections as under: Energy:Hybrid energy system in the city : Energy-plus-houses !houses with solar panels to produce energy" produce more green energy than they need. #ntegrated community energysolutions linking houses, wind and solar parks, biomass sites and electric vehicles are the foremost initiative towards an integrated urban energy system of the future. $.g.: %auban, &reiburg has built houses which produce more energy than they actually consume. The aim is to making a city in which all the homes produce a positive energy balance and which isemissionsfree and '() neutral. *lus$nergy+ is a coined concept developed by ,olf -isch. Solar canals !where solar panels are placed over canal water bodies" produce energy while slowing water loss and utilizing the space of canal intapping solar energy.Alternatives to nonrenewable resources should be adopted soon. #ndia being tropical country has huge potential to harness the solar energy through solar panels. *opulations need two basic things to be prosperous and healthy: reliable access to safe water and electricity, this concept aims at delivering reliable power to the people while conserving water by preventing evaporation.+ http:..en.wikipedia.org.wiki.*lus$nergy !The concept used in %auban")The pilot pro/ect is estimated to generate +0 lac units of clean energy per annumand also prevent evaporation of 12 lac litres of water annually from the canal.Buildings:Multi-storey Buildings: 3esser land wastage which thereby allows the land saved to be dedicated towards plantations. &ormation of 'lub or 'ommunity where people of similar interests are located together. The cost of public goods decrease with size in such a case. The communities here contribute towards welfare of all. ,ooftop water harvesting can also be propagated.4444444444444444444444444444444444444444444444444444444444444444444444444444444444Pollution: *ollution in cities is largely caused by in three parts: Air, water and land.Air pollution being largely caused by transportation and industry shall be discussed in further subheadings. 5ere we discuss the waste disposal a6ecting the land. Separating organic waste, recyclable waste and electronic waste !including lithium ion batteries". 7aking recycling stations in the city on the lines of *orto Alegre. The recyclable material and organic material can be collected twice a week by 7unicipal 'orporation. ,ecyclable material such as paper, cans, metals, plastics, glass and plastic bottles have immediate commercial value. After separation at the depots, these materials may be crushed anddirectly sold to companies.$.g.: Soda cans, for e8ample, have a very short lifespan on the market: #t takes /ust 92 days for the cans to be disposed, recycled and returned to supermarket shelves. :esides, it saves a lot of money for the companies by saving them from the cost of buying the crude aluminium.A Green Exchange programme to bene;t the environment and socially deprived groups should be put into practise. 3ow income families living in the out of reach of the waste carts can exchange their rubbish bags ) The 'anal top Solar *ower pro/ector bus tic!ets and ood. 'hildren can exchange reusable "aste "ith school articles# chocolate# toys and tic!ets to entertainment e$ents. The pro/ect will result in less household waste in the streets as well as in sensitive areas such as rivers and parks. Such practices will also reoods, buildings need to be condemned and the land must be converted into parks.The resilient city of the future will already integrate security concepts and systems at the design stage of urban planning and policy implementation, therefore ensuring the capability to identify and dominate emerging risks as well as to e6ectively manage catastrophic situations and