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@geoengineering1

Oct 11

🚨An analysis of forest-based projects funded through the sale of #CarbonCredits shows that 10% of them may have a net warming effect on the climate because of the way they alter the Earth’s #albedo, or how much sunlight is reflected back into space.

DETAILS🧵1/12

2/ Albedo is how much sunlight Earth’s surface reflects vs. absorbs

Forests are darker than grass or snow, meaning they absorb more heat

So when grasslands or snowy areas are turned into forests, Earth’s surface can absorb more heat, partly cancelling out cooling effect of #CDR

3/ So, this study analyzed 172 Afforestation, Reforestation & Revegetation projects in the Voluntary Carbon Market - projects that collectively aim to deliver nearly 800 million tons of CDR over the next century.

But none of these projects’ standards account for albedo change.

Read 13 tweets

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@geoengineering1

Oct 8

🚨New paper argues that rejecting Carbon Dioxide Removal (#CDR) on moral hazard grounds may itself be unjust.

Using a framework of transitional justice, they propose that CDRs can, if carefully governed, form part of a just transition to a livable climate.

🧵1/9

2/ The authors note that with climate overshoot increasingly inevitable, the IPCC and Climate Overshoot Commission both view CDRs as unavoidable.

The question shifts from whether to use CDRs to how to deploy them justly.

3/ The authors apply transitional justice - a framework for navigating imperfect choices to reach fairer outcomes.

It asks: when can seemingly unjust actions (like risky technologies) be justified to achieve a more just, sustainable future?

Read 10 tweets

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@geoengineering1

Oct 1

🚨The Earth is reflecting less & less sunlight, new study reveals🚨

Satellite data show the planet is reflecting less sunlight than it used to, with the Northern Hemisphere darkening fastest.

This imbalance has big implications for climate and rainfall.🧵1/8

2/ Using 24 years of NASA’s CERES satellite data, scientists found both hemispheres now absorb more solar energy than before.

But the Northern Hemisphere has pulled ahead, darkening faster than the South.

3/ This breaks a long-standing balance: for decades, Earth’s hemispheres reflected nearly the same amount of sunlight.

That symmetry was thought to be maintained by clouds. But the new data shows the NH is diverging.

Read 9 tweets

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@geoengineering1

Sep 25

🚨Can buildings remove CO₂ while cooling indoor air?

A new study shows that adding CO₂ capture units (#DAC) to building cooling systems can cut energy use by over 50% & remove atmospheric carbon, even in hot, humid places.

Details🧵1/10

2/ Buildings use a lot of energy. About 37% of global energy & 40% of CO₂ emissions.

Cooling is the biggest part, taking almost 40% of building electricity.

As the planet warms, cooling demand rises, creating a vicious cycle.

3/ Direct Air Capture extracts CO₂ directly from ambient air, unlike point-source capture.

But adsorption-based DAC struggles in humid environments: water competes with CO₂ for sorbent sites, making it very energy-hungry.

Read 12 tweets

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@geoengineering1

Sep 19

🚨A new study presents the 1st structural prototype of a planetary sunshade - a large space-based system at L1 designed to block some sunlight & cool Earth.

Using solar sails, deployable booms & CubeSat-based frames, it outlines a pathway for space-based #geoengineering.🧵1/11

2/ The planetary sunshade would function as a vast array of satellites at the Sun–Earth L1 point, collectively blocking ~1.8% of incoming photons - enough to reduce global temperatures by ~2 °C.

"Unlike #SAI or orbital dust, it promises uniform, reversible cooling."

3/ The team followed European spacecraft design standards, testing different ideas with decision matrices & computer simulations (finite element analysis) to choose materials & structures that could actually survive launch.

Read 12 tweets

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@geoengineering1

Sep 12

🚨New Viewpoint published in Frontiers that responds to Siegert et al.’s paper.

While Siegert et al. warn against polar #geoengineering, Moore et al. argue for a compassionate harm-reduction paradigm, keeping geoengineering research open alongside decarbonization.

Details🧵1/12

2/ Siegert et al. [] critically assessed polar geoengineering proposals, urging restraint.

Their case: interventions are risky, may not work, and could distract from the essential task which is deep decarbonization.frontiersin.org/journals/scien…

3/ Moore et al. [] reply that this “consequences-based paradigm” (raising alarms to spur action), has dominated climate science for 50 years.

Yet emissions remain high, tipping points loom, and Arctic ice is collapsing.frontiersin.org/journals/scien…

Read 13 tweets

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