Bronte Wells
Rocket launches are an integral part of the 21st century, but they are also a source of pollution. Rockets burn fossil fuels and emit carbon dioxide (CO2), water vapour, nitrogen oxides, carbon soot, carbon monoxide, and other pollutants. The SpaceX Falcon Heavy rocket has been noted to emit more CO2 in a few minutes than a car would in 2 centuries of driving. This comparison, however, has been deemed erroneous by some as aircraft release pollutants within the troposphere and lower stratosphere, while rockets release pollutants from the surface of the Earth up to the mesosphere, where the pollution lasts longer. Nevertheless, the Falcon Heavy rocket's emissions contribute to global warming and climate change, and with increasing launch rates, there are concerns about the impact on ozone recovery and the environment.
| Characteristics | Values |
|---|---|
| Carbon dioxide emissions | Equivalent to a single car over 200 years or 40 cars over 5 years |
| Carbon dioxide emissions in the first stage of launch | 116 tons of CO2 in 165 seconds |
| Comparison with other rockets | Falcon Heavy emits more carbon dioxide than Falcon 9 |
| Comparison with aircraft | Rocket launches emit less than aircraft |
| Comparison with cars | Exhaust is similar to a normal internal combustion car but a lot more at once |
| Other emissions | Water vapour, NOx, carbon soot, carbon monoxide, sulfur compounds, nitrogen oxides, alumina particles, chlorine, hydrochloric acid |
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What You'll Learn
The Falcon Heavy emits as much CO2 as a car in 2 centuries
The Falcon Heavy rocket has been criticised for its environmental impact, particularly concerning its carbon dioxide emissions. According to sources, the SpaceX Falcon Heavy emits as much carbon dioxide in a few minutes as a car would in two centuries of driving. This comparison highlights the significant amount of CO2 produced by the rocket in a short time.
The Falcon Heavy rocket, like many others, uses Rocket Propellant-1 (RP-1), a highly refined form of kerosene, as its fuel. When burnt, RP-1 produces carbon dioxide, water vapour, nitrogen oxides, carbon soot, carbon monoxide, and sulphur compounds. The exhaust from burning RP-1 is similar to that of a typical internal combustion engine car, but the rocket releases a much larger quantity in a shorter period.
The high emissions from the Falcon Heavy and other rockets have raised concerns about their impact on the environment and climate change. Rocket launches contribute to pollution in the upper layers of the Earth's atmosphere, where the released pollutants can last longer and have a more significant impact. The soot produced by rockets can linger in the stratosphere for years, absorbing solar radiation and potentially affecting the ozone layer.
While some argue that the number of rocket launches is relatively small compared to other industries, the increasing launch rates and the cumulative effect of multiple launches could undermine progress made in ozone recovery. Additionally, the large amount of carbon dioxide emitted in a short time by the Falcon Heavy is a concern, especially as the space industry continues to grow.
It is worth noting that there are challenges in eliminating all CO2 emissions from rocket launches. Currently, there is no alternative method to reach space without burning propellants. However, there is ongoing research and experimentation with new types of fuel that may burn cleaner, such as methane-based fuel, to reduce the environmental impact of rocket launches.
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The Falcon Heavy uses RP-1, a highly refined jet fuel
The Falcon Heavy is a powerful rocket with an impressive payload capacity, second only to NASA's Space Launch System. Based on the Falcon 9's fuselage and engines, the Falcon Heavy is a composite structure with a unique design. Its maiden launch took place on February 6, 2018, carrying a Tesla Roadster and a mannequin dubbed "Starman."
RP-1 is also known for its reliability and energy density, delivering approximately 35 MJ/kg (megajoules per kilogram). This energy output translates into exceptional performance, with the engines producing 1.7 million pounds of thrust during liftoff. The combination of RP-1 and liquid oxygen as an oxidizer yields a specific impulse of around 311 seconds at sea level, showcasing the efficiency of the rocket's propellant usage during ascent.
While RP-1 has advantages, it is important to consider environmental concerns. Rocket launches contribute to pollution, and the Falcon Heavy emits a significant amount of carbon dioxide. In just a few minutes, it releases more CO2 than a car would in two centuries of driving. This highlights the impact of rocket emissions on the environment and the need for cleaner propellants.
Despite the environmental impact, rocket launches are integral to our modern world, and the benefits of the space industry are significant. Additionally, the percentage of fossil fuels burned by the space industry is relatively low compared to conventional aviation. While there are ongoing efforts to reduce pollution, it is challenging to eliminate all CO2 sources due to the physics of space travel.
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SpaceX's carbon debt from Falcon Heavy launches
SpaceX's Falcon Heavy rocket produces a significant amount of carbon dioxide and other pollutants, contributing to the company's carbon debt. According to some estimates, a single Falcon Heavy launch emits more carbon dioxide in a few minutes than a car would in two centuries of driving. This equates to the emissions of 40 cars over five years or 120 cars worth of emissions over the next five years, considering there have been three Falcon Heavy launches so far.
The high carbon dioxide emissions of the Falcon Heavy rocket are due to the combustion of Rocket Propellant-1 (RP-1), a highly refined form of kerosene or jet fuel. RP-1 is a popular choice for rocket fuel because of its stability at room temperature and relatively low cost. However, when burnt, it produces carbon dioxide, water vapour, nitrogen oxides, carbon soot, carbon monoxide, and sulphur compounds.
The pollution from Falcon Heavy launches is not limited to carbon dioxide. The rocket's exhaust also contains soot, which can spread throughout the upper atmosphere and contribute to additional warming through radiative forcing. Falcon Heavy launches have also been associated with the release of nitrogen oxides formed from the heating of atmospheric air by hot rocket exhaust gases.
While SpaceX has not disclosed specific carbon debt calculations for Falcon Heavy launches, the company has acknowledged the environmental impact of its operations and is exploring ways to reduce carbon emissions and mitigate their effects.
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Falcon Heavy's carbon footprint compared to other rockets
The Falcon Heavy rocket has been criticised for its carbon emissions, with some claiming that it emits more carbon dioxide in a few minutes than a car would in 2 centuries of driving. However, it is important to note that the Falcon Heavy rocket has only been launched 3 times as of 2021, and thus its total carbon emissions are equivalent to the emissions of 120 cars over the next 5 years.
A study published in the academic journal, Physics of Fluids, modelled the fumes and exhaust of a rocket, specifically the Falcon 9, from launch up to 42 miles (67 km) into the atmosphere. The study found that in the lower atmosphere, the amount of carbon dioxide emitted by the rocket was not substantial compared to the surrounding air. This is because the rocket is travelling very quickly, and the lower atmosphere has a denser concentration of gases, including carbon dioxide. However, once the rocket passes an altitude of 27 miles (43.5 km), it starts emitting more than one cubic kilometer's worth of carbon dioxide for each kilometer it climbs.
Another study by Ioannis Kokkinakis, a researcher at the University of Nicosia, found that rocket launches emit vastly more carbon dioxide in the upper atmosphere than typically exists. The study also found that rockets emit significant amounts of nitrogen oxides in the lower atmosphere, which can interact with water to create acid rain and damage fragile ecosystems. Nitrogen oxides can also cause serious respiratory issues.
When comparing the carbon footprint of different rockets, it is important to consider the type of engine and propellant used. For example, the Falcon Heavy rocket uses kerosene-based fuel, which emits carbon dioxide like any other fossil fuel. On the other hand, Bezos' Blue Origin rocket uses a hydrogen-based fuel that emits mostly water vapour and some nitrogen oxides. Virgin Galactic also claims that its rockets are environmentally friendly as they burn for only 60 seconds and fly hundreds of times, reducing their carbon footprint per passenger.
Overall, while the Falcon Heavy rocket has a significant carbon footprint, it is important to consider the infrequent nature of its launches and compare it to the carbon emissions of other rockets and industries.
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The impact of Falcon Heavy's emissions on the climate
The Falcon Heavy rocket has been criticised for the amount of carbon dioxide it emits. According to sources, a Falcon Heavy launch emits the same amount of carbon dioxide as a car would over 200 years of driving. This is because Falcon Heavy rockets combust RP-1, a highly refined jet fuel or kerosene that produces carbon dioxide, water vapour, NOx, carbon soot, carbon monoxide, and sulfur compounds.
While the space industry only accounts for about 1% of the fossil fuels burned by conventional aviation, the impact of rocket emissions on the climate is not just about the quantity of emissions but also the altitude at which they are released. Rocket emissions are released from the surface of the Earth up to the mesosphere, and pollution released into the upper layers of the atmosphere lasts longer than earthbound sources. Furthermore, the soot from rocket emissions can act as an umbrella, absorbing solar radiation.
Nitrogen oxides are also formed from the heating of atmospheric air by hot rocket exhaust gases, and their impact at lower altitudes can be detrimental. Stratospheric balloons used to test technology for space missions have revealed that the stratosphere contains particles containing metals vapourised from the re-entry of satellites and rocket boosters. These colourful polar stratospheric clouds can encourage ozone-depleting chemical reactions.
While some argue that the benefits of the space industry outweigh the pollution caused by rocket launches, others point out the irony of an organisation like NASA, which studies the atmosphere, contributing to its pollution. Additionally, the manufacture of reusable launch vehicles has a reduced carbon emission effect compared to disposable vehicles. Companies like SpaceX are also experimenting with new types of fuel, like methane-based fuel, that may burn cleaner and leave less soot residue.
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Frequently asked questions
The Falcon Heavy rocket emits more carbon dioxide in a few minutes than a car would in 2 centuries of driving.
The Falcon Heavy rocket combusts the oil-based rocket fuel RP-1, which produces carbon dioxide, water vapour, NOx, carbon soot, carbon monoxide, and sulfur compounds.
Falcon Heavy's emissions are released from the surface of the Earth to the mesosphere, while aircraft release pollutants within the troposphere and the lower stratosphere. Therefore, Falcon Heavy's emissions last longer and have a more significant environmental impact.
