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This technology is in its early stages of development. It has become more important due to its relevance in agriculture sector. As, India has many issues(For example, late monsoon) related to agriculture sector. This technology can become solution to these problems in future.

What is Cloud Seeding?

1. Cloud seeding is a form of weather modification, a way of changing the amount or type of precipitation that falls from clouds, by dispersing substances into the air that serve as cloud condensation or ice nuclei, which alter the microphysical processes within the cloud.
2. The usual intent is to increase precipitation (rain or snow), but hail and fog suppression are also widely practiced in airports.
3. The history of cloud seeding has experienced uncertain results because it can never be known whether a cloud that rains after seeding might have rained anyway. This is because seeding is performed on clouds that look like they have some potential for producing rain.

Cloud Seeding Methods

There are three cloud seeding methods: static, dynamic and hygroscopic.

1. Static cloud seeding involves spreading a chemical like silver iodide into clouds. The silver iodide provides a crystal around which moisture can condense. The moisture is already present in the clouds, but silver iodide essentially makes rain clouds more effective at dispensing their water.
2. Dynamic cloud seeding aims to boost vertical air currents, which encourages more water to pass through the clouds, translating into more rain [source: Cotton]. Up to 100 times more ice crystals are used in dynamic cloud seeding than in the static method. The process is considered more complex than static clouding seeding because it depends on a sequence of events working properly. Dr. William R. Cotton, a professor of atmospheric science at Colorado State University, and other researchers break down dynamic cloud seeding into 11 separate stages. An unexpected outcome in one stage could ruin the entire process, making the technique less dependable than static cloud seeding.
3. Hygroscopic cloud seeding disperses salts through flares or explosives in the lower portions of clouds. The salts grow in size as water joins with them. In his report on cloud seeding, Cotton says that hygroscopic cloud seeding holds much promise, but requires further research.

Pros of Cloud Seeding:

(1) It creates rain, providing relief to drought-stricken areas

Of course, this is the best advantage of cloud seeding as it is its main purpose after all. Offering the ability to reduce the impact of droughts by and bring stimulating rain is very powerful. It can lead to more crop yields, and the best part is, this could occur in areas that might not have supported crops in the past. This means that this technology has the potential to get rid of future water scarcity and famine for some regions.

(2) It makes a place more hospitable

Due to extreme heat, some parts of the world have become dry, even making them unsuitable to live in or visit. But thanks to cloud seeding, we can increase the probability of rainfall and make these typically dry areas much more hospitable. As a result, these places will be become habitable and will be able to receive more tourists, helping the overall economy. The potential effects of this technique are definitely far reaching.

(3) It would allow for economic growth

If farmers were able to grow and sell more crops, then a region’s overall economy would improve greatly. Aside from agriculture, we have previously mentioned that tourism would also be boosted, where previously inhospitable places would be transformed into desirable holiday spots. The boost in economy would then circulate among the local residents and improve their living conditions.

(4) It can reduce crop damage

The technology of cloud seeding has been effectively utilized in suppressing undesirable forms of precipitation, such as hail, which can cause damage to crops and cities. As you can see, it can alter or modify storm clouds that would produce hail and other frozen forms of precipitation otherwise.

(5) It has the potential to help regulate the weather

Even the best regions to grow crops are facing severe weather, which means that they are still suffering some damage to their produce. Luckily, this technology is stated to have the capability to regulate atmospheric conditions through water vapor, so this problem would also be solved.

Cons of Cloud Seeding:

(1) It uses chemicals that might be harmful.

As cloud seeding basically involves the use of chemicals and putting them in the air, it does have the potential to harm plants, animals and people, or the environment as a whole. The way the chemicals are being used in this technology and would affect the organisms that will be hit by the artificial rainfall is considered its most direct concern. As of yet, scientists and researchers have been able to state the complete effect of this technique. Though silver iodine is not currently known to be hazardous to human health, this might change in the future as more and more research is being conducted and completed.

(2) It can lead to abnormal or unpredictable weather patterns and flooding.

Though cloud seeding is believed to regulate the weather, some people fear that it might ultimately change climatic patterns on the planet. Places that are normally receiving moisture might start experiencing drought due to the artificial process of adding chemicals to the atmosphere to stimulate rain. Remember that once the compounds used by this technology are released into the atmosphere, we will have no control over what type of weather would form afterwards. There are several possible consequences, such as excessive rain that can cause flooding, which means that regions experiencing chronic water shortage would suffer more, as they probably do not have any system designed to deal with floods and other disasters.

(3) It is yet to be fully proven as cost-efficient and effective.

Assessments done on the effectiveness of cloud seeding is not foolproof so far. Since it is used mostly on clouds that already show signs of potential rainfall, it is not known if the technique is actually the reason for producing rain.

(4) It can cause cloud pollution.

As the artificial rain falls, seeding agents like silver iodide, dry ice or salt will also fall. While research on the effects of silver iodide is still ongoing, there have been found high levels of the residual silver discovered in places near cloud-seeding projects, which are considered toxic. As for dry ice, it can also be a source of greenhouse gas that contributes to global warming, as it is basically carbon dioxide.

(5) It is a costly process.

The cost of cloud seeding is indeed astronomical, considering the procedures involved in it, such as delivering chemicals to the sky and releasing them into the air by flare shots or airplanes. Of course, the costs of chemicals add up to the overall amount. The expense we pay for cloud seeding can be justified if the amount of rainfall during the first attempt would thoroughly water crops and saturate the ground, otherwise the process would have to be repeated even up to several times.

The Way Forward

As the procedure is still in its early development stages, a lot of changes to improve it can be expected. Trying to address the problem of drought is an ongoing battle, so as the debates around the world about its use. Determining if cloud seeding is good or bad is definitely not easy, but by taking into account the pros and cons listed above, you will be able to have a better understanding about its functionality and efficiency.

Q.) “Is Cloud Seeding a solution for rising irrigation problems in Indian Agriculture Sector.” Critically examine.

References:

http://www.physics.org/article-questions.asp?id=98

http://science.howstuffworks.com/nature/climate-weather/meteorologists/cloud-seeding1.htm

https://flowpsychology.com/10-pros-and-cons-of-cloud-seeding/