Brian Barton
SpaceX's rocket launches have been criticised for their negative environmental impact. The company has been described as developing a carbon-intensive business with uncertain impacts on the environment. SpaceX's rockets use kerosene and methane-based fuels, which emit carbon dioxide, water vapour, soot, and nitrogen oxides—all of which have a warming effect on the Earth's atmosphere. The altitude at which these gases are emitted is also cause for concern, as pollution released into the upper layers of the atmosphere lasts longer than earthbound sources. SpaceX has declined to comment on pollution from rockets and does not publish its emissions widely. However, the company has obtained licenses to grow its fleet to over 40,000 satellites, which has sparked worries about the environmental impact of satellite incineration and the potential damage to the planet's magnetic field and ozone layer.
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What You'll Learn
- SpaceX's rockets use kerosene and methane-based fuels, which emit carbon dioxide, water vapour, soot and nitrogen oxides
- The pollutants are released at high altitudes, where they last longer than earthbound sources
- SpaceX's satellites are expected to total 40,000, increasing the odds of decommissioned satellites hitting the planet
- SpaceX's Starship is the biggest rocket ever built and one of the dirtiest
- SpaceX does not publish its emissions
SpaceX's rockets use kerosene and methane-based fuels, which emit carbon dioxide, water vapour, soot and nitrogen oxides
SpaceX's rockets use kerosene and methane-based fuels, which emit carbon dioxide, water vapour, soot, and nitrogen oxides. Kerosene is a highly refined fuel known as RP-1 (Rocket Propellant-1) and is one of the most popular rocket fuels, having helped launch iconic rockets such as the Falcon 9. Kerosene is popular because it is cheaper, stable at room temperature, and isn't dangerously explosive. However, it is considered "dirty" by some experts due to the emissions it produces.
Methane is also being considered as a potential future fuel, with SpaceX's rocket Starship planning to use a mix of liquid methane and liquid oxygen propellants. However, any hydrocarbon fuel, including methane, produces some amount of soot. Even "green rockets", propelled by liquid hydrogen, produce water vapour, which is a greenhouse gas at high altitudes.
The emissions from SpaceX's rockets are released from the surface of the Earth up to the mesosphere, and pollution released at these upper layers lasts longer than earthbound sources. As the number of rocket launches increases, the cumulative effect of these emissions will become more significant, and the impact on the atmosphere and ozone layer will become clearer.
In addition to the emissions from rocket fuel, the increasing number of satellites in low Earth orbit poses another environmental concern. As the number of satellites increases, the odds of decommissioned satellites and their debris hitting the planet rise. The pollution from burned satellites and the potential disruption to the Earth's magnetic field and ozone layer are serious risks that need to be addressed through foresight and regulation.
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The pollutants are released at high altitudes, where they last longer than earthbound sources
The environmental impact of rocket launches has been a cause for concern for conservationists. While television and film often portray spaceflight as having little to no impact on the environment, the reality is quite different. Rocket engines emit pollutants into the atmosphere, and with the number of commercial rocket launches expected to increase significantly over the next two decades, the cumulative effect of these launches on the environment will become more pronounced.
The pollutants released by rocket launches include soot, carbon dioxide, water vapour, and nitrogen oxides. These emissions have a warming effect on the Earth and can damage the ozone layer. The impact of these pollutants is compounded by the altitude at which they are emitted. Rocket launches release pollutants from the surface of the Earth up to the mesosphere, and pollution released into these upper layers lasts longer than earthbound sources. Aircraft, for example, release pollutants within the troposphere and the lower stratosphere.
The specific pollutants emitted depend on the type of fuel used. Most launched rockets currently use kerosene fuel, which emits carbon dioxide, water vapour, and soot directly into the atmosphere. SpaceX's future rocket, Starship, plans to use a mix of liquid methane and liquid oxygen propellants. While liquid methane is considered a more sustainable alternative to kerosene, it still produces some amount of soot. Even "green rockets," propelled by liquid hydrogen, produce water vapour, which is a greenhouse gas at high altitudes.
The increase in the number of satellites in low Earth orbit is also a cause for concern. As the number of satellites increases, so does the risk of decommissioned satellites and their debris falling back to Earth and releasing pollutants into the atmosphere. SpaceX alone has a constellation of over 6,000 satellites in orbit, and the company has obtained licenses to grow this number to over 40,000 satellites. The pollution from these satellites and their reentry could pose a serious risk to the environment, particularly the ozone layer.
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SpaceX's satellites are expected to total 40,000, increasing the odds of decommissioned satellites hitting the planet
SpaceX's satellites are expected to total 42,000, with the company having obtained licenses to grow their fleet to over 40,000 satellites over the next several years. This massive constellation of satellites, known as Starlink, is designed to provide fast and cheap internet access to people worldwide. However, the sheer number of satellites raises concerns about the impact on the environment and the risk of satellite reentries causing injuries or deaths.
Each Starlink satellite is designed to last only 5 years, after which they will burn up in the atmosphere. While SpaceX claims that no orbital debris will be created and no satellite parts will hit the ground, scientists worry about the potential pollution and health risks associated with satellite reentries. High levels of aluminum, copper, and lithium in the atmosphere from decomposing satellites can threaten the Earth's protective ozone layer and magnetic field, which shields us from cosmic radiation.
The increasing number of satellites in low Earth orbit also raises the odds of decommissioned satellites and other objects colliding, creating dangerous space debris. SpaceX has already experienced the loss of 40 satellites due to a geomagnetic storm, and experts warn that more extreme events could have more significant impacts. The National Oceanic and Atmospheric Administration (NOAA) had predicted the possibility of the storm, but SpaceX launched anyway, resulting in a financial loss of $50-100 million.
The Federal Communications Commission (FCC) has calculated that falling Starlink satellites could result in up to 500,000 separate objects reaching the Earth's surface over six years. While the risk to any individual is extraordinarily low, there is still a chance of injury or death. SpaceX disputes these claims, stating that their satellites will create a maximum of 10 fragments each, with only a fraction posing a risk to people. However, with the expected increase in satellite reentries, the potential for pollution and harm to the planet's protective layers is a growing concern.
Overall, the planned rollout of SpaceX's Starlink satellite constellation highlights the need for more foresight and regulation in the satellite industry. As companies race to fill space with thousands of satellites, the potential environmental and safety consequences cannot be overlooked.
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SpaceX's Starship is the biggest rocket ever built and one of the dirtiest
SpaceX's Starship is the biggest rocket ever built and, because of its size, it is also one of the dirtiest. The rocket uses a mix of liquid methane and liquid oxygen propellants as fuel. While this type of fuel is more environmentally friendly than the kerosene-based fuels used by many other rockets, it still produces some soot.
In addition, the sheer size of the rocket means that it will release pollutants over a wider area. Rocket launches already release pollutants over a much larger area than aircraft, as they release emissions from the surface of the Earth up to the mesosphere. This means that the pollution from each launch lasts longer than that from aircraft emissions.
The increase in the number of rocket launches is also a cause for concern. In 2023, SpaceX launched nearly 100 rockets, with most of these flights building its Starlink satellite constellation. SpaceX has plans to launch thousands more Starlink satellites, which could have a significant environmental impact. The satellites will be in low Earth orbit and will only last for around 5 years before burning up in the atmosphere and leaving behind pollutants.
The pollution from SpaceX's rockets and satellites is a particular concern due to the lack of regulation in the industry. Regulators do not set rules related to pollution, and companies like SpaceX are not transparent about their emissions. This lack of transparency makes it difficult to understand the full impact of their activities on the environment.
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SpaceX does not publish its emissions
SpaceX's rockets have been described as "one of the dirtiest" due to their use of kerosene and methane-based fuels, which emit carbon dioxide, water vapour, soot, and nitrogen oxides. These emissions have a warming effect on the Earth and damage the ozone layer. In 2023, SpaceX launched nearly 100 rockets, with most flights building its Starlink satellite constellation. The company has obtained licenses to grow their fleet to over 40,000 satellites, which has raised concerns about the potential pollution caused by the re-entry of decommissioned satellites.
The absence of emissions data from SpaceX raises concerns among scientists and the public about the potential impact of their launches on the environment. While SpaceX has declined to comment on pollution from rockets and satellites, the increasing number of launches and the planned expansion of their satellite constellation are expected to contribute to escalating levels of emissions.
The pollution caused by SpaceX's launches is not limited to their rocket fuel. The company's Scope 1 emissions also include transporting rockets and employees, as well as fuel burned during testing and building. Scope 3 emissions, which are typically harder to count, include the emissions associated with the manufacture and transport of materials, tools, and services purchased by SpaceX.
The cumulative effect of SpaceX's launches and their specific rocket design can potentially exacerbate the environmental impact. Scientists have called for more research and regulation to address the pollution caused by rocket launches and the potential consequences for the Earth's atmosphere and ozone layer.
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Frequently asked questions
SpaceX's rockets have been described as "one of the dirtiest" due to their use of kerosene and methane-based fuels, which emit carbon dioxide, water vapour, soot and nitrogen oxides directly into the atmosphere. SpaceX does not publish its emissions data, but researchers have found that the pollutants emitted by rockets have a warming effect on the Earth and deplete the ozone layer.
SpaceX has not commented on its pollution from rockets and satellites, but its future rocket, Starship, will use a mix of liquid methane and liquid oxygen propellants.
Aircraft release pollutants within the troposphere and the lower stratosphere, whereas rockets release pollutants from the surface of the Earth up to the mesosphere. Therefore, rocket pollutants last longer and have a more significant environmental impact.
