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Dr Kristina Hill 🏳️‍🌈
Everyone who’s counting on planting more trees to sequester carbon- read this. If soil moisture decreases,plants could release as much co2 as they store, and slow down their rate of carbon uptake. Just when we need the uptake most, around mid century. We need to stop emitting.
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irony aficionado Sep 26
Replying to @kzhill @Noahpinion
We need to stop emitting, yes, but don’t we also need to do a full press sequestration strategy? most of what I hear about sequestration sounds weak at best, fantastical and wa$teful at worst. there must be ways to get carbon out of the atmosphere and back into the ground.
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Dr Kristina Hill 🏳️‍🌈 Sep 26
Replying to @pcdillard @Noahpinion
Yes - but we need to be realistic about what we expect from plants. If we’re counting on sequestration in places that are drying out, that study says we are misplacing our efforts. Coastlines will be wetter, and river flood plains - May be better bets.
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eleanorina Sep 26
how the grasslands and pastures are managed makes a difference to sequestration and improve how the soils behave wrt water,
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eleanorina Sep 26
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eleanorina Sep 26
by focusing on the regeneration through managed grazing, the number of trees can increase,
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eleanorina Sep 26
that the water retention of the soil can be improved is visible here:
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eleanorina Sep 26
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BabyBoomerWriter Sep 26
Replying to @kzhill @HankGreelyLSJU
Still, shouldn't we take hope in the phrase: "may not be able," & direct scientific efforts toward finding a way to mitigate this hazard?
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Hank Greely Sep 26
Planting trees seems close to harmless; no reason to stop. I think the tweeter is just saying that tree planting is no reason to stop trying to shrink emissions. It's uncertainty, plus a form of the moral hazard argument, made with CO2 removal, geoengineering, & adaptation.
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Dr Kristina Hill 🏳️‍🌈 Sep 26
Is tree planting close to harmless if it represents an investment of limited resources where trees can’t thrive, or will be replaced by grasses as fire regimes change, releasing carbon 30 years from now?
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Greg Newton Sep 26
imho planting trees is virtually always a constructive effort. Every bare patch in the world needs to be covered. Plants form synergistic relationships with micrograms to lock carbon away in the soil. No plants, no carbon cycling. No time for pessimism; skip work, go plant a tree
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Max White Sep 25
Replying to @kzhill @Weather_West
... Do trees decrease soil moisture? Forest soil retains more water and trees themselves primarily get water from deep tap roots
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Dr Kristina Hill 🏳️‍🌈 Sep 25
Not that I know of - but, changes in air temp and frequency of rainfall do reduce soil moisture.
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Fireflysquid Sep 26
Trees also emit monoterpenes which are themselves cloud condensation nuclei(CCN) and creates rainfall. Soil moisture shouldn’t be an issue.
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💀 Gallows God 💀 Sep 26
Trees also create atmosphere that allows storm systems to come through. Arid land creates high pressure walls that self reinforce desertification. We can change the weather (to an extent) and sequester carbon.
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Fireflysquid Sep 26
Very cool. I didn’t know that.
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💀 Gallows God 💀 Sep 26
Yeah, the Sahara wasn't always a desert. But once something's sun baked land, rural or paved, it raises the temp which creates high pressure zones the storm systems tend to go around instead of though.
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Fireflysquid Sep 26
During the ice age it was very temperate as well, I’ve read. I wonder what other mysteries are hidden there in plain sight as well.
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Greg Newton Sep 26
Replying to @kzhill @ayanaeliza
It's the soil that will store mass quantities of carbon. We need to stop the emitting but also need to drawdown carbon by rapidly building soils, repairing ecosystems and restoring carbon and water cycling. We need : farmer, rancher, forester and fisher.
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