this post was submitted on 26 Jul 2024
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As a starting point, the burning of fossil fuels, and to a lesser extent deforestation and release of methane are responsible for the warming in recent decades: Graph of temperature as observed with significant warming, and simulated without added greenhouse gases and other anthropogentic changes, which shows no significant warming

How much each change to the atmosphere has warmed the world: IPCC AR6 Figure 2 - Thee bar charts: first chart: how much each gas has warmed the world. About 1C of total warming. Second chart: about 1.5C of total warming from well-mixed greenhouse gases, offset by 0.4C of cooling from aerosols and negligible influence from changes to solar output, volcanoes, and internal variability. Third chart: about 1.25C of warming from CO2, 0.5C from methane, and a bunch more in small quantities from other gases. About 0.5C of cooling with large error bars from SO2.

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Space is becoming an 'unsustainable environment in the long term,' ESA says (www.space.com)
submitted 3 months ago* (last edited 3 months ago) by [email protected] to c/[email protected]
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"Overall, the report is full of bad news that is good news."

At least, that's one of the findings from the 2024 Space Environment Report published by the European Space Agency (ESA) on July 23. The report offers an accounting of satellites and debris accumulating in Earth's orbit. ESA's latest report, which has been published annually since 2017, is like a census for space activities and shows how bad the problem is becoming. According to its data, there are more than 35,000 objects being tracked by surveillance networks, with approximately 26,000 being pieces of debris larger than 4 inches in size.

The report suggests that despite an improved effort to mitigate this massive amount of space debris, the junk has continued to pile up. So much so, in fact, that we are creating "an unsustainable environment in the long-term," the report says.

Just this week, SpaceX revealed the 6,200 satellites in its Starlink megaconstellation have had to make almost 50,000 collision-avoidance manuevers over the past year, dodging junk and debris in low-Earth orbit. The company also had an on-Earth near-miss in May, after debris from one of its Crew Dragon spacecraft landed throughout the mountains of North Carolina, including on private residences.

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[โ€“] [email protected] 6 points 3 months ago (1 children)

Also gps

[โ€“] [email protected] 1 points 3 months ago* (last edited 3 months ago)

Well, those are in higher orbits where there's a lot more space. LEO is the biggest problem because it's got the majority of all satellites and debris and it's relatively small. GEO ~~is also pretty crowded~~, but almost all the satellites there are flying in neat synchronization, because, well, Geostationary orbits.

Edit:

Maximum debris concentrations can be noted at altitudes of 800-1000 km, and near 1400 km. Spatial densities in GEO and near the orbits of navigation satellite constellations are smaller by two to three orders of magnitude.