cross-posted from: https://lemm.ee/post/44301765

Link here... https://www.weather.gov/tsa/wbgt

• https://piped.video/watch?v=EBN9JeX3iDs
• https://www.youtube.com/watch?v=EBN9JeX3iDs

--- Video Description:

Direct Air Capture (DAC) has been getting more and more attention over the last few years. Could we avert climate change by pulling carbon dioxide out of the atmosphere? Could we not just stop, but actually reverse the damage done? Unfortunately, most don't fully appreciate just quite how much CO2 we've emitted and the outrageous scale of the problem facing us. Today, we apply the fundamental principles of thermodynamics to question whether this is even feasible.

Written & presented by Prof. David Kipping. Edited by Jorge Casas. Fact checking by Alexandra Masegian.

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Channel Description:

Space, astronomy, exoplanets, astroengineering and the search for extraterrestrial life & intelligence.

The Cool Worlds Lab, based at the Department of Astronomy, Columbia University, is a team of astronomers seeking to discover and understand alien worlds, particularly those where temperatures are cool enough for life, led by Professor David Kipping.

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CHAPTERS (and key bits)

• 0:00 Climate Change: Some CC is needed just to maintain a level.
• 2:44 Removal Requirements: We released 37 Gt of CO₂ in 2022.
• 3:38 Possible Solutions: Trees are good for 4 years, then no space.
• 5:03 Introducing DAC: IPCC estimates 20 Gt/yr @ 2050 required.
• 5:43 Climate Anxiety: This video is sponsored by betterhelp.
• 7:12 DAC Principles: Currently 19 DAC plants remove 10'000 tCO₂/yr, or 0.000003% of global emissions.
• 8:14 Scalability: Why this video focuses on physics, not economics
• 9:29 Thermodynamics: Why DAC is a fight against entropy, introducing Gibbs. Lower limit: 120 kWh/tCO₂
• 12:08 Progressive DAC: Starting in 2025, remove how much and how fast?
• 13:32 RCPs: Why 2.6 is discarded, why 4.5 is chosen (with an outlook on 8.5)
• 15:09 Simulations: For 450 ppm, we need to scrub 20 GtCO₂ in 2050. For 350, almost 80 Gt.
• 17:03 Energy Requirements: 450 ppm requires 5% of global electricity. 350: 15%.
• 19:34 Efficiency: Above numbers assumed 100% efficiency. Current estimate 5%, measured 8%.
• 21:21 Conclusions: It's tough to do, but just possible. Easiest way: Stop emitting.
• 24:35 Outro and credits

"Already this month, 14 days have recorded surface air temperatures greater than 17°C (62.6°F) — spikes that have not been seen for roughly 125,000 years.

"In fact, Wednesday marked the 17th straight day with global temperatures hotter than any prior days on record."

Credits to wabooti

From The Guardian

https://wandering.shop/@rosemarymosco

• "If we are able to significantly reduce greenhouse gas emissions, U.S. sea level in 2100 is projected to be around 0.6 meters (2 feet) higher on average than it was in 2000.
• On a pathway with high greenhouse gas emissions and rapid ice sheet collapse, models project that average sea level rise for the contiguous United States could be 2.2 meters (7.2 feet) by 2100 and 3.9 meters (13 feet) by 2150." Source: climate.gov

This is a pretty polished app. I've started using it.

Just trying to lighten the mood just a little.

My sincere hope is that someday we will not need this community and I can delete it. But for now this is what we all face.

Source: IPCC AR6 WGI, Figure SPM.1b, p. SPM-7