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Some researchers say the geo-engineering technique could limit rising temperatures that are causing climate change. After direct input from several aerospace and engine companies, the scientists said they have developed a design that could be suitable and could be ready to be deployed in 15 years, aiming to cut the rate of temperature change in half. (Photo: Pixabay) Spraying sun-dimming chemicals high above the Earth to slow global warming could be “remarkably inexpensive”, costing about $2.25 billion a year over a 15-year period, according to a study by US scientists.Some researchers say the geoengineering technique known as stratospheric aerosol injection (SAI) could limit rising temperatures that are causing climate change.As yet unproven and hypothetical, it would involve the use of huge hoses, cannons or specially ac motors Suppliers designed aircraft to spray large quantities of sulphate particles into the upper layer of the atmosphere to act as a reflective barrier against sunlight.

Total costs to launch a hypothetical SAI effort 15 years from now would be USD 3.5 billion, scientists at Harvard University said in a report published in the journal Environmental Research Letters, adding that average annual operating costs would be about USD 2.25 billion a year over 15 years.Discounting other methods of deployment because of cost and feasibility, the research assumes a special aircraft can be designed to fly at an altitude of about 20km and carry a load of 25 tonnes.After direct input from several aerospace and engine companies, the scientists said they have developed a design that could be suitable and could be ready to be deployed in 15 years, aiming to cut the rate of temperature change in half.

The scientists emphasised that this is merely a hypothetical scenario.“We make no judgment about the desirability of SAI. We simply show that a hypothetical deployment programme commencing 15 years hence, while both highly uncertain and ambitious, would indeed be technically possible from an engineering perspective. It would also be remarkably inexpensive,” the report said.There are risks to such unproven potential technologies. Scientists have said SAI could result in negative consequences such as causing droughts or extreme weather in other parts of the world, harm crop yields as well as potential public health and governance issues.It also does not address the issue of rising carbon dioxide emissions, the main greenhouse gas blamed for global warming.Commenting on the study, Phil Williamson at the University of East Anglia said: “Such scenarios are fraught with problems - and international agreement to go ahead with such action would seem near-impossible to achieve.”(Source)

Sandilya, sources said.According to industry sources, the informal group was to take inputs from the CEOs of the auto companies on how to deal with the issue..Some of the past presidents of automotive industry body SIAM have come together to consult with heads of other carmakers to figure out a way forward after the Supreme Court banned registration of al single phase motors Suppliers Some of the past presidents of automotive industry body SIAM have come together to consult with heads of other carmakers to figure out a way forward after the Supreme Court banned registration of all diesel SUVs and cars with engines above 2,000 cc in Delhi/NCR.

Some of SIAM past presidents in the group include M&M executive director Pawan Goenka, Toyota Kirloskar Motor vice-chairman Vikram Kirloskar and Eicher Motors chairman S.The auto industry has been grappling with uncertainty after the Supreme Court order on December 16 banning registration of diesel-run vehicles having engine capacity above 2,000 cc in Delhi-NCR

Peddling away by itselfBut it’s not a car; it’s a three-wheeled Electric Vehicle (EV) that Chin has dubbed the “persuasive electric vehicle,” or PEV.The challenge of moving people and things around the world’s dense, growing major cities is bad and getting worse.”It has a top speed of 12 miles per hour and operates in bicycle lanes.As opposed to most shared bike systems, the PEV would “redistribute itself,” as Chin puts it—traveling autonomously from the drop-off point of one passenger to its next user’s location, thus solving the problem of shortages and oversupply of bikes at different times in different locations.Ryan Chin, a research scientist at the MIT Media Lab, specialises in dreaming up solutions to urban transportation problems. With a carbon fiber exterior shield, a foldable canopy, and a 250-watt assist motor, the autonomous tricycle is “persuasive” in that it’s designed to “encourage positive modal shifts in mobility behaviour in cities.

 The challenge of moving people and things around the world’s dense, growing major cities is bad and getting worse. It can be adapted for a human rider or for package transport, and it has the sensors and intelligence to operate autonomously.And it could become a pervasive mode for urban package delivery, moving easily through crowded streets and reducing congestion and carbon emissions from gas-powered delivery vehicles. Ninety per cent of the world’s population growth in this century will be in “megacities”, and cities will soon account for 80 per cent of global carbon emissions, according to the United Nations Environment Program.Much of that will come from idling cars stuck in miles-long traffic jams.. His latest invention, unveiled at the EmTech conference earlier this week in Cambridge, Massachusetts, tries to marry the three dominant trends in urban automobiles: autonomy, vehicle sharing, and electrification.