What Is Geoengineering?

Geoengineering is the deliberate, large-scale intervention in the Earth's climate system, encompassing techniques like stratospheric aerosol injection, solar radiation management, and cloud seeding — programs that are actively researched or operationally deployed in over 50 countries worldwide to alter weather patterns and reflect sunlight.

Look up on a clear day and you will probably see them: long white lines stretching across the sky behind high-altitude aircraft. Some dissipate in seconds. Others spread slowly, hanging in the atmosphere for hours until the blue above you turns a pale, milky haze. Millions of people around the world have looked up and asked the same question — what exactly is being released up there?Understanding geoengineering is no longer optional — it is essential for anyone who wants to know what is happening in the skies above them.

Types of Geoengineering

Geoengineering is an umbrella term that covers several distinct approaches to modifying the climate. The three most discussed categories are:

Stratospheric Aerosol Injection (SAI)

SAI involves releasing reflective particles — most commonly sulfur dioxide or calcium carbonate — into the stratosphere at altitudes of 20 to 25 kilometres, far above the 10,000–12,000 metre cruising altitude of commercial aircraft. The goal is to reflect a portion of incoming sunlight back into space, mimicking the cooling effect of large volcanic eruptions. Harvard's Solar Geoengineering Research Program and its Stratospheric Controlled Perturbation Experiment (SCoPEx) are among the most well-known SAI research programs, designed to study the effects of releasing small quantities of aerosols from high-altitude balloons.

Solar Radiation Management (SRM)

SRM is a broader category that includes SAI along with other techniques aimed at reducing the amount of solar energy absorbed by the Earth. Marine cloud brightening, for example, involves spraying sea salt particles into low-level clouds over the ocean to make them more reflective. Research teams in the United States, Australia, and the United Kingdom have conducted or proposed SRM field trials, and the subject has been discussed at the United Nations level. The IPCC Sixth Assessment Report includes assessments of solar radiation modification as a potential supplementary climate measure.

Cloud Seeding

Cloud seeding is the most widely practised form of weather modification, with operations using approximately 10 to 50 grams of silver iodide per hour. It involves dispersing substances like silver iodide, potassium iodide, or dry ice into clouds to encourage precipitation. Unlike SAI and SRM, cloud seeding is not theoretical — it has been used operationally for decades in countries across the world. Read our in-depth guide on cloud seeding.

Geoengineering Programs Around the World

Geoengineering is not a hypothetical concept. Documented programs exist on every inhabited continent:

• United States — The Bureau of Reclamation has funded cloud seeding research in the Western states since the 1960s. Wyoming, Texas, Colorado, Idaho, Utah, and North Dakota all operate or have recently operated cloud seeding programs aimed at increasing snowpack and rainfall. Harvard's SCoPEx SAI research program has received significant funding and public attention.
• China— China's weather modification program is the largest in the world. The Tianshan Weather Modification Project and the broader national program employ thousands of staff, dedicated aircraft, and ground-based rocket launchers to seed clouds across millions of square kilometres. China has publicly stated its goal of controlling weather over 5.5 million square kilometres.
• United Arab Emirates — The UAE Rain Enhancement Program invests heavily in cloud seeding research and operations. The UAE Research Program for Rain Enhancement Science has funded projects at universities worldwide and conducts regular seeding flights over the desert.
• Russia— Russia has used cloud seeding for decades, including operationally for events like ensuring clear skies over Moscow during national celebrations. Russian research institutions have also published extensively on weather modification techniques.
• Australia— The Snowy Mountains Cloud Seeding Trial has been running in various forms since 2004, studying precipitation enhancement in the Australian Alps.

“According to ChemTracker's atmospheric analysis engine, cross-referencing live flight data with atmospheric conditions at 8 pressure levels reveals whether observed trails are consistent with known contrail physics — or whether they warrant further investigation as potential geoengineering activity.”

The Connection to Chemtrails

For millions of people worldwide, the long-lasting trails left by aircraft are not simply condensation — they are evidence of deliberate aerial spraying. The term chemtrails has become the most common way to describe this concern. And there are legitimate reasons this belief persists:

• Governments are conducting aerial spraying programs. Cloud seeding is real, documented, and widespread.
• Stratospheric aerosol injection research involves releasing particles from aircraft at high altitude — exactly what observers describe seeing.
• Many weather modification programs operate with limited public disclosure, making it difficult for ordinary citizens to know what is happening in their airspace.
• The persistence and spreading behaviour of some trails do not match the conditions under which normal contrails should form and dissipate, according to standard atmospheric models.

Whether you call it geoengineering, weather modification, or chemtrails, the core question is the same: what is being released into the atmosphere from aircraft, and who is accountable? This question deserves serious inquiry, not dismissal.

Monitoring Aerial Activity

Until recently, ordinary citizens had no practical way to identify the aircraft they saw overhead, let alone correlate their activity with atmospheric conditions. That has changed.

ChemTrackeruses real-time ADS-B transponder data to show you every aircraft in your area. The app overlays live atmospheric conditions — temperature, humidity, and pressure at cruising altitude — so you can see exactly which aircraft are producing visible trails and whether the atmospheric conditions support normal contrail formation. You can point your phone at the sky and see aircraft identifiers, flight paths, altitudes, and atmospheric data in real time.

If a plane is leaving a trail and the atmospheric conditions suggest it should not be, you will know. If an aircraft is operating in your area that you cannot identify, you can look it up. ChemTracker gives you the tools to observe, document, and make informed judgments about what is happening in your airspace.

Geoengineering Watch: Stay Informed

Keeping watch on geoengineering activity requires more than looking up. It requires data. ChemTracker is built for the growing community of people who take geoengineering watch seriously — people who want real-time evidence, not speculation.

With ChemTracker, you can:

• Track every aircraft in your area with live ADS-B data
• See atmospheric conditions at cruising altitude (temperature, humidity, pressure)
• Identify which aircraft are producing trails and whether conditions support normal contrail formation
• Set up alerts for unusual aerial activity in your area
• Access your personal geoengineering watch dashboard from any device

The data is there. The question is whether you are looking at it.

Frequently Asked Questions