today we are having global warming evrywhere ask any one and he will tell u that we never required an air conditioner in the house in mumbai about 20yrs back.today to some extent we cant survive without it. This has resulted because of cutting trees, destroying forests and occupation of open areas. by building SEZ we are going to have a lot of open area converted into a concrete jungle. just think what effect it will have on environemnt also. We will get to know about the effect it has in a few years. Economic development is necesary but not at the cost of environment.