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DanielleFong's profile
𝓓𝑎𝑛𝑖𝑒𝑙𝑙𝑒 𝓕𝑜𝑛𝑔, 𝕖𝕩-𝕡𝕣𝕠𝕕𝕚𝕘𝕪
𝓓𝑎𝑛𝑖𝑒𝑙𝑙𝑒 𝓕𝑜𝑛𝑔, 𝕖𝕩-𝕡𝕣𝕠𝕕𝕚𝕘𝕪
𝓓𝑎𝑛𝑖𝑒𝑙𝑙𝑒 𝓕𝑜𝑛𝑔, 𝕖𝕩-𝕡𝕣𝕠𝕕𝕚𝕘𝕪
@DanielleFong

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𝓓𝑎𝑛𝑖𝑒𝑙𝑙𝑒 𝓕𝑜𝑛𝑔, 𝕖𝕩-𝕡𝕣𝕠𝕕𝕚𝕘𝕪

@DanielleFong

𝔞 𝔟𝔩𝔞𝕤𝔱 𝔣𝔯𝔬𝔪 𝔱𝕙𝖊 𝔭𝔞𝔰𝔱 𝕝𝕖𝕧𝕖𝕝 𝟛𝟚 𝕤𝕠𝕣𝕔𝕖𝕣𝕖𝕤𝕤, 𝕙𝕒𝕣𝕕𝕔𝕠𝕣𝕖 𝕞𝕠𝕕𝕖

.earth  🌎
daniellefong.com
Joined February 2008

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    1. michael_nielsen‏ @michael_nielsen 21 Nov 2019
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      It may not be possible to get the literal cost of DAC to $10 / tonne - there are some interesting thermodynamic analyses which suggest skepticism (eg https://www.pnas.org/content/pnas/108/51/20428.full.pdf … ).

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    2. michael_nielsen‏ @michael_nielsen 21 Nov 2019
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      But there are nonetheless three reasons to be optimistic: (1) research has already led to substantial cost reductions (arguably a factor 3 or so), and may well go further with more work;

      1 reply 1 retweet 7 likes
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    3. michael_nielsen‏ @michael_nielsen 21 Nov 2019
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      (2) carbon intensity (CO2 / GDP) has been dropping by 18% per decade. If it continues, then as a fraction of GDP, the cost of capturing CO2 will go down commensurately; and

      1 reply 0 retweets 8 likes
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    4. michael_nielsen‏ @michael_nielsen 21 Nov 2019
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      (3) large, wealthy countries like France and Sweden have CO2 emissions about 4 times lower, per capita, than the US. With similar approaches, the total cost of capturing CO2 in the US could be reduced several-fold.

      2 replies 0 retweets 4 likes
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    5. michael_nielsen‏ @michael_nielsen 21 Nov 2019
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      Of course, points (2) and (3) are intertwined, not independent!

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    6. michael_nielsen‏ @michael_nielsen 21 Nov 2019
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      Does this mean a Clean Air Act priced solution (as a fraction of GDP) possible? Not yet. But it does seem like a real possibility.

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    7. michael_nielsen‏ @michael_nielsen 21 Nov 2019
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      There are also many potential problems - in particular, the cost estimates may simply be much too optimistic. More research needed on this and other points!

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    8. michael_nielsen‏ @michael_nielsen 21 Nov 2019
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      Finally, a point to emphasize: none of this means DAC is the right approach. Rather, I did this as a kind of bounding, worst-case analysis to see just how bad the problem is. In fact, there may well be much better approaches than DAC, and combinations of approaches.

      1 reply 1 retweet 10 likes
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    9. michael_nielsen‏ @michael_nielsen 21 Nov 2019
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      I often chat with people who fatalistically see climate as an insoluble collective action problem. I'm reminded of people I met growing up who thought nuclear war (or acid rain) was inevitably going to kill us.

      3 replies 8 retweets 46 likes
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    10. michael_nielsen‏ @michael_nielsen 21 Nov 2019
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      There can be a kind of hubris to pessimism, a failure to account for human ingenuity, & to think that if we can't see a full solution now, then one must be impossible. This doesn't mean one should just hope for the best; it does mean valuing small progress & imperfect solutions!

      9 replies 19 retweets 98 likes
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      𝓓𝑎𝑛𝑖𝑒𝑙𝑙𝑒 𝓕𝑜𝑛𝑔, 𝕖𝕩-𝕡𝕣𝕠𝕕𝕚𝕘𝕪‏ @DanielleFong 22 Nov 2019
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      Replying to @michael_nielsen

      To me, it seems like direct atmospheric carbon capture is running seriously uphill just because of the densities. The thermodynamic efforts of trees to capture carbon seem instructive here — they develop 10 bar of osmotic pressure just to supply water, of which about 90% is lost

      11:02 AM - 22 Nov 2019
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      • 𝓓𝑎𝑛𝑖𝑒𝑙𝑙𝑒 𝓕𝑜𝑛𝑔, 𝕖𝕩-𝕡𝕣𝕠𝕕𝕚𝕘𝕪 Brian who survived a powerline
      0 replies 1 retweet 2 likes

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