Let Us Paint India White

What if every Indian rooftop could cool our homes, quench our thirst, and fight climate change—just by being painted white?

The Breakthrough

This roof paint blocks 97% of sunlight and pulls water from the air

Scientists at the University of Sydney, in collaboration with Dewpoint Innovations, have created a nano-engineered polymer coating that does something extraordinary:

• Reflects 97% of sunlight, cooling interiors by up to 6 °C

• Condenses atmospheric moisture, yielding clean water even in semi-arid zones

• Requires no electricity or external input — just sunlight and air

During six-month trials at the Sydney Nanoscience Hub, this coating produced up to 4.7 L of water per 12 m² roof per day, remaining stable under harsh sun without chemical degradation.

Imagine the Indian Scale

Parameter	Per 1,000 sq ft roof	1 Crore homes
Water produced	≈ 40 L / day	≈ 120 billion L / year
Cooling effect	~ 6 °C lower indoor temp	15 % less AC power use
Electricity saved	1 kWh / day / home (avg)	36 TWh / year — equal to output of 5 large power plants

Why India Needs This

1. Rising temperatures are pushing peak AC demand beyond grid capacity.

2. Water scarcity still haunts 40 % of Indian districts.

3. Rooftops—India’s largest unused asset—can become both solar shields and micro-reservoirs.

This innovation perfectly aligns with:

• Jal Jeevan Mission (rural drinking water)

• Smart Cities Mission (climate-resilient infrastructure)

• PM Surya Ghar Muft Bijli Yojana (rooftop utilization)

Call to Action

“May I suggest that the Ministry of Jal Shakti, CSIR, and IIT Madras jointly pilot

 this coating across five climate zones—testing Indian formulations before the next

 summer peaks?”

Such a partnership could localize materials, train MSMEs for application, and

 unlock an entirely new ‘Water-from-Air’ industry.

Past Advocacy

Over the past decade, I’ve written several blogs on water scarcity and technology

—from ‘Water Wars Are Looming’ (2018) to ‘Procuring Technology for Cascade

 Filtration’ (2022)—all urging India to embrace decentralized water generation.

👉 Full archive shown below

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Letter to Shri C. R. Patil, Hon. Minister for Jal Shakti

( minister-jalshakti@gov.in )

Dear Sir,

This breakthrough offers India a dual remedy—cooling our homes while

 replenishing our water tables.

I urge your Ministry to contact Dewpoint Innovations (info@dewpointinnov.com)

 for technology transfer and joint trials with Indian research institutes.

With warm regards,

Hemen Parekh

www.HemenParekh.ai | www.IndiaAGI.ai | www.My-Teacher.in

05 Nov 2025

“Safed Chhat – Thanda Ghar – Paani Har Parivar.”

Every roof is a reservoir waiting to happen.

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My past ( 17 ) blogs on WATER SCARCITY ( as on March 2022 )

 

 2022 ( 2 )

Procuring Technology for “ CASCADE WATER FILTRATION “  ..[ 03 Mar 2022 ]

 Procuring Technology for “ Drinking Water “ …………………………..[ 17 Feb 2022 ]

 

2021 ( 2 )

Mumbai Desalination Plant / a White Elephant ?.....................[ 24 Nov 2021 ]

With a pinch of Salt ?......................................................... [ 29 June 2021 ]

 

 2019 ( 3 )

 A candid admission ? ………………………………………………………………….[12 July 2019 ]

The Biggest FREE Desalination Plant:Sun+Sea………………………… [ 09 July 2019 ]

Water above our heads……………………………………………………………….[ 29 Mar 2019 ]

 

2018 ( 7  )

A Desperate Measure ? ………………………………………………………………[ 18 Nov 2018 ]

Making Water from Air ?...................... ………………………………….[ 26 Oct 2018 ]

Water  Mutiny  of  2020……………………………………………………………..[ 17 June 2018 ]

Water Wars Are Looming !..................................................[ 09 June 2018 ]

Writing  is  on  the  Wall ……………………………………………………………[ 08 May 2018 ]

Replicating   Nature  ?........................................................[ 23 Mar 2018 ]

Deja Vu ? #Latur #Marathwada #Waterwar……………………………..[ 28 Feb 2018 ]

 

2017 ( 2 )

Water Water Everywhere ? Even in Latur ?.............................[ 15 Apr 2017 ]

Not a straightforward Answer !.......................... …………………….[ 03 Mar 2017 ]

 

2016 ( 1 )

Water Wars ?  …………………………………………………………………………. 08 Apr 2016