Good questions raised and we have debated earlier in this thread on this topic.
Further, Someone has already commented at the end of the article
” Meaningless fears! India impounds only 20% of its rainfall. and if we do more rain water harvesting , it will take care of all our requirement”
I tend to agree to this point.
Rain water apart, while how they arrived at conclusion is not given, i suspect Perhaps the authors seem to have ignored other considerations.
(1) Hydrogen consumption is a closed loop system. Hydrogen is produced from water…But when Hydrogen is finally burnt as fuel as in automobile or domestic gas it will produce steam H2O which goes to atmosphere which comes back in rain as water.
.(2) if hydrogen is used as in a fuel cell to produce electricity for example for grid connectivity , the bye product is water which can be recycled back.
(3) Even if hydrogen is used to produce Fertiliser such as Ammonia ,DAP, SSP. which are used to raise food crops which we eat as carbohydrates and carbohydrates produce water when human body metabolise.
(4) we are lucky that our country and our geographical location is such that we have Surrounded by Sea all around East coast, West coast and south india…While rain water harvesting there is a lot of scope and we still have a long way to go , desalination of sea water always remains as an option.
(5) Coming back to Rain where India can take massive efforts in rain water harvesting , nature and Rain God has been very kind to give us 2 monsoons- SW monsoon during June- Sept and NE monsoon in Oct-Dec.
We have Himalaya in North and western ghats and eastern ghats which ensure that we have enough rain in southwest monsoon during June- Sept during which The Himalayan ranges form a barrier to the southwest monsoon winds crossing over to Tibetian low pressure area thereby causing heavy to very heavy rainfall . The western Ghats slso.act as a key barrier, intercepting the rain-laden monsoon winds that sweep in.
The Northeast monsoon ( Oct- Dec)arises due to high-pressure zones that are formed over the Siberian and Tibetan plateaus.
Winds all the way from Siberia blow towards India…However they are blocked by the northern Himalayas which do not allow them to enter the Indo-Gangetic plain. However, they escape from the North-eastern Himalayas and enter Bay of Bengal and from there the moister laden wind blows towards south east sn bring rainfall to the eastern coastal states of South India, including Tamil Nadu, Andhra Pradesh, and parts of Kerala
Therefore , we will never have dearth of water in india- we are lucky. Analysis is short-sighted
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