Has Hawaii chemtrails

If planes were to shift their altitude by 600 meters, they would be more climate-friendly

Global warming through contrails
They are not as innocent as they know what the contrails look like in the sky: they too contribute to global warming.
As pretty as they are sometimes to look at, contrails are not without it.

You have to know that

  • Contrails occur when aircraft fly at an altitude of over 8,000 meters.
  • The exhaust gases meet very cold air there and ice crystals form - which hold back heat on the earth.
  • The contrails thus contribute to global warming. If the flight altitudes were adjusted, this could be prevented.

Some conspiracy theorists are suspicious of the contrails that airplanes often pull in the sky. But this is not about chemtrails but about contrails, as the English name for contrails is. If an airplane flies very high, where the air is below minus 40 degrees, the exhaust and soot particles serve as nuclei for ice crystals. Indeed, these contrails are not without their problems - albeit in a different way than what conspiracy theorists suggest.

The ice crystals prevent heat from being released from the earth into space and thus contribute to global warming. It is true that some of the strips also reduce solar radiation and reflect sunlight. But only during the day. In the evening and at night they act like a blanket and thus ensure that the earth cannot cool down. Most contrails disappear after a few minutes. Some, however, can persist for hours, depending on the humidity. Contrails were observed by satellite and lasted for 17 hours.

The effect cannot be neglected: in Central Europe, where air traffic is particularly brisk, calculations show that around 10 percent of the sky is covered by contrail cirrus clouds - this is what the clouds that form as a result of the strips are called. In less flown areas, 0.1 to 0.4 percent of the sky is covered by these. Scientific estimates assume that the effects on global warming are as large as those caused by the CO2 that is generated when flying.



A new study has now calculated on the basis of specific flight data how much would benefit the climate if the aircraft were to fly around particularly humid layers of air, in which the contrails are particularly long-lived. The results were published in the journal Environmental Science & Technology and showed that minimal changes could reduce the effects on global warming caused by contrails by up to 59 percent.

Science check ✓

Study: Mitigating the Climate Forcing of Aircraft Contrails by Small-Scale Diversions and Technology Adoption According to the authors, however, the findings can be applied to air traffic at the same latitude plus minus. The question of how much contrails contribute to global warming, on the other hand, has been relatively little researched and is therefore still fraught with uncertainties. More information on this study ...Reliability: Database for air traffic data in Japanese aviation space (carats), modeling of kerosene consumption using data from Base of Aircraft Data 3 (BADA3), weather data from the European Center for Medium-Range Weather Forecast (ECMWF), peer-reviewed.Study type: ModelingFunders: Lloyd's Register Foundation, Imperial College London. All information about the higgs science check

The researchers combined flight data of the Japanese flight space with emission calculations, calculations for the formation of contrails, estimates of the climatic impact and with weather and climatic data. From this they deduced which flight routes produce the longest-lasting contrails. 2.2 percent of the flights are responsible for 80 percent of the energy balance shift due to contrails. The scientists calculated alternative flight routes for these cases. Specifically, this means that the aircraft fly up to 600 meters lower in summer and up to 600 meters higher in winter, because particularly humid air masses usually do not extend further vertically. Flights between 3 p.m. and 6 a.m. are affected - when the cirrus clouds cannot reflect solar radiation back into space and thus have a positive benefit.

On some routes this leads to slightly more kerosene consumption and thus to more CO2. On average, however, the measures lead to a clear improvement: If only 1.7 percent of flights were diverted, 59 percent of the negative effects of contrails would be eliminated - and only 0.014 percent more CO2 would be emitted.

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The switch to modern combustion technologies would bring even more. However, these cannot be replaced overnight in all aircraft. The altitude, on the other hand, can theoretically be adjusted tomorrow.

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