India has a bad mix of illiterates in the areas that are green, and who with their burning and subsistence farming methods have destroyed all vestiges of greenery and forest cover in the country. States like Haryana have indulged in rapacious destruction of tall tree covers etc. for furniture and Gurgaon consumption.
I personally dont subscribe to the idea of planting plants by every urban individual as there are other ways to contribute by not doing destructive activities. For 98 percent of Mumbaiites this is not a practical idea, nor do they know how long it takes for a tree to grow, and what it needs. It will just finish off with a few placards, film industry ka publicity bhooka items and hand holding ceremonies, candle burning activiteis and end of the story.
Mumbai - Hiranandani destroyed the Powai ecosystem which had hills, green cover, lakes, rock climbing facilities through indiscriminate quarrying activities resulting in Powai lake Water Hyacinth problems. The Malad Mangrove is a major area under threat by large builders, a engineering or some such college coming up, and other such stuff.
So all in all there is government, BMC, builder, bankers nexus in systemic systematic rapacious destruction of conservative land cover. Concrete roads buildings and A/C usage further trap heat and do not allow it go upwards, A/cs add to ozone layer destruction. Chloro-floro carbons from A/cs are documented destroyers of the ozone protective layer and Mumbai does have a bad cover, exposing our skins to harmful radiations which next provides industry for skin lotions, something unheard of, and not required 20 years back.
Usage of bottled water and plastic bottles has created a 100 billion USD industry in US that is wrecking envrionment and the Pacific Ocean beach area - this is one area where we can clearly contribute by avoiding wide spread purchase, and provide disposal systems of this. Remember, valuable oil reserves are also utilized in plastic manufacture.
Cheap washing powders, bar soaps, plastic covers non biodegradable types needs to be stopped.
Ensure your bus and jeep contractors transporting s/w or airline workers have proper pollution checks and certifications of their vehicles, refuse to hire over 15 year vehicles just because Accounts is not willing to subsidise.
Wherever possible, subscribe for e-books and e-bank statements, e-cheques and e-paper, this will save a few trees. Encourage BYOB shops - Bring Your own Bags. These are popular overseas, however in India, the shops are more keen to use large plastic bags to advertise their own brand. (it would help if this paragraph is sent to Mr Biyani :-) - no personal offense ).
America and Canada individual wise contribute to 20 units of per capita destruction of the envrionment on account of their development. China and others come a distance down between 5 and 10. India comes much lower, but we have 1/5 of the world population, and even less land cover, our water management is extremely poor, and our civil / civic sense in cities contribute to maybe higher figures. In 5 years, we will have 40% of population in our cities, so one can imagine how many Dharavi's each city would be having destroying water and land resources, ground water just under the ground cover which will go saline due to over usage and borewelling activities.
There is lots and lots more ... this topic requires a 200 page textbook with studies and practicals in 10th - 12th curriculum compulsory for all lines whether arts / commerce / sciences. Mass mobilization without proper education will have only pockets of educated preventive activities which will not benefit taking into account the problems involved.
ETRM Energy Trade Risk Management is a new science in India, some companies like TCS - Wipro - Infosys - Sungard are workign around areas to help the corporate sector to clean up their work in exchange for commercial gain and brownie points and savings in regulartory and compliances.