Climate Damage Caused by Growing Space Tourism Needs Urgent Mitigation

A formidable space tourism industry may have a greater climate effect than the aviation industry and undo repair to the protective ozone layer if left unregulated, according to a new study led by UCL Earth’s Future.

Courtesy of UCL.

Published today in the journal Earth’s Futureresearchers from UCL, the University of Cambridge and Massachusetts Institute of Technology (MIT) used a 3D model to explore the impact of missile launches and re-entry in 2019, and the impact of projected space tourism scenarios based on the recent billionaire space race .

The team found that black carbon (soot) particles emitted by rockets are almost 500 times more efficient at holding heat in the atmosphere than all other sources of soot combined (surface and aircraft) — resulting in an enhanced climate effect.

Furthermore, while the study revealed that the current loss of total ozone due to rockets is small, current growth trends around space tourism indicate potential for future depletion of the upper stratospheric ozone layer in the Arctic in spring. This is because pollutants from solid-fuel rockets and re-entry heating of returning spacecraft and debris are particularly harmful to stratospheric ozone.

Study co-author Dr Eloise Marais (UCL Geography) said: “Rocket launches are routinely compared to gas and air pollutant emissions from the aircraft industry, which we demonstrate in our work is erroneous.

“Soot particles from rocket launches have a much larger climate effect than aircraft and other Earth-bound sources, so there doesn’t need to be as many rocket launches as international flights to have a similar impact. What we really need now is a discussion amongst the experts on the best strategy for regulating this rapidly growing industry.”

To calculate the findings, the researchers collected information on the chemicals from all 103 rocket launches in 2019 from across the world, as well as data on reusable rocket and space junk re-entry. They also used the recent demonstrations by space tourism Virgin Galactic, Blue Origin entrepreneurs and SpaceX and proposed yearly offerings of at least daily launches by Virgin Galactic to construct a scenario of a future formidable space tourism industry.

These data were then incorporated into a 3D atmospheric chemistry model to explore the impact on climate and the ozone layer.

The team show that warming due to soot is 3.9 mW m-2 from a decade of contemporary rockets, dominated by emissions from kerosene-fuelled rockets. However, this is more than doubles (7.9 mW m-2) after just three years of additional emissions from space tourism launches, due to the use of kerosene by SpaceX and hybrid synthetic rubber fuels by Virgin Galactic.

The researchers say this is of particular concern, as when the soot particles are directly injected into the upper atmosphere, they have a much greater effect on climate than other soot sources — with the particles 500 times more efficient at retaining heat.

The team found that, under a scenario of daily or weekly space tourism rocket launches, the impact on the stratospheric ozone layer threatens to threaten the experienced recovery after the successful implementation of the Montreal Protocol.

Adopted in 1987, the Montreal Protocol global ban on substances that deplete the ozone layer is considered one of the most successful international environmental policy interventions.

Study co-author Dr Robert Ryan said: “The only part of the atmosphere showing strong ozone recovery post-Montreal Protocol is the upper stratosphere, and that is exactly where the impact of rocket emissions will hit hardest. We weren’t expecting to see ozone changes of this magnitude, threatening the progress of ozone recovery.

“There is still a lot we need to find out about the influence of missile launch and re-entry emissions on the atmosphere – in particular, the future size of the industry and the types and by-products of new fuels like liquid methane and bio -derived fuels.

“This study allows us to enter the new era of space tourism with our eyes wide open to the potential impacts. The conversation about regulating the environmental impact of the space launch industry needs to start now so we can minimise harm to the stratospheric ozone layer and climate.”

Figure 1: Locations and fuel types of missile launches in 2019. Marker size in the map indicates the number of launches at each location. Pie charts indicate the proportion of the four main fuel types at each launch location. Numbers above each pie chart are total propellant mass used in each country. Additional details are in Table S1 in Supporting Information S1.

Figure 6: Effect of rocket launch and re-entry emissions on global climate forcing. Bars show the GEOS-Chem-RRTMG top-of-the-atmosphere instantaneous radiative forcing of BC (orange), combined O3 and CH4 (blue) and polar stratospheric clouds (PSCs, red) after a decade of growth in 2019 emissions (left ) and after 3 years of constant space tourism emissions and growth in 2019 emissions (right). The black solid line is the net effect of all forces. 3.3 Impact of Proposed Space Tourism

The full paper in Earth’s Future: “Impact of Rocket Launch and Space Debris Air Pollutant Emissions on Stratospheric Ozone and Global Climate.”


 

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