I was travelling with my Uncle from Chembur to Thane West and my uncle pointed out to me the Back waters where the sea water surges into the land where salt is being made using the surge of sea water during high tide. considering the fact that the price of land in Mumbai is always very high, i was wondering how these kind of prime land very next to the express way are left vacant, it appears that if sufficient land is not kept for the sea water to enter then there might be accumulation of sand and over a period of time the pressure gets built up from the sea water and one fine day there might be a tidal wave incursion inwards on to the constructed buildings that has the potential to cause lot of damage to life and materials. further i was able to see lot of vegetation on the area supposedly  meant for salt water incursion, which means that there are plants that can withstand the salt water habitat of the sea. these kind of vegetation can be encouraged on these waste lands and atleast the atmosphere gets cleaner. further another observation that i made was to the right of the Express way ,ie. on the sea ward side the atmosphere was clear and i was able to see the buildings on the navi mumbai side , where as on the mainland side, the atmosphere was hazy with lot of pollution. So it makes sense to have more of this open natural land. it is really a surprise that even this much land is made available for natural sea water to come and go. Another thing i observed when i went for  a walk on the Sanjay Gandhi National Park,Thane was that the greenery till midway  on a steep hill slope to the western side of the enterance to the Sanjay Gandhi National Park was barren. i heard from my uncle that the population of Leopards has multiplied three times in the last six years and there is not enough prey for these leopards and hence they approach the villages for easy prey like children playing in the Padas. These Leopards venture to places like vasanth vihar too and one of the leopards even came int the security cabin in one of the apartment blocks. all these might be due to the lack of proper routes for the animals to move form one green cover to another.