David Ho
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davidho.bsky.social
David Ho
@davidho.bsky.social
110K followers 2.8K following 12K posts
Climate scientist; ocean carbon cycle and climate solutions. Professor, University of Hawaiʻi at Mānoa; Visiting Faculty, Arizona State University. https://linktr.ee/david_ho
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davidho.bsky.social
I guess someone thought it was significant that the guy was driving a Tesla.

velo.outsideonline.com/news/tesla-d...
An image showing the Golden Gate Bridge in the background with a silhouette of a cyclist in the foreground. Text at the bottom states: "Tesla Driver Stabs Cyclist Near Golden Gate Bridge."
November 11, 2025 at 12:20 AM
davidho.bsky.social
The rise in the number of objects in space, especially in low Earth orbit, over the past decade is astounding.

www.academie-sciences.fr/grandes-cons...
Graph titled *“Évolution dans le temps de la population orbitale”* showing the evolution of the number of catalogued orbital objects (satellites and debris) as a function of altitude (200–2000 km) for the years 2000 (blue line), 2011 (red line), and 2023 (green line). The y-axis shows the number of catalogued objects, and the x-axis shows altitude in kilometers (in 5 km bins). The 2023 curve is significantly higher overall, with several peaks labeled: * Around 350–600 km: a sharp rise marked *“Constellation Starlink”* and *“Attention front dense !”* indicating a dense zone of satellites. * Around 400 km: a peak labeled *“Stations CSS, ISS”*. * Around 850 km: a smaller peak labeled *“Zone d’augmentation spontanée par collisions”* (spontaneous collision growth zone). * Around 980 km: a labeled *“Zone de stabilité > 1 000 ans”* (stable orbit zone). * Around 1200 km: labeled *“OneWeb”*. * Around 1400 km: labeled *“Globalstar”*. Overall, the 2023 data (green) show a dramatic increase in low Earth orbit (LEO) satellite density compared with 2011 and 2000, especially between 500 and 600 km altitude. Caption: “Figure 3. Évolution du nombre des satellites en fonction de l’altitude entre 200 et 2000 km (CNES).”
November 10, 2025 at 3:07 PM
davidho.bsky.social
Forest and other biomass techniques might be the most cost-effective methods of CO₂ removal (CDR), but they're certainly not the most effective. But if you're only interested in greenwashing, why waste your money on real CDR?

www.statista.com/chart/35418/...
This infographic titled "Forests Remain the Most Cost-Effective Way to Capture Carbon" compares the weighted average price per carbon credit for various carbon removal methods in 2023, measured in dollars per ton of CO₂ equivalent ($/tCO₂e). The methods listed and their respective prices are: Forest management: $12/tCO₂e (the most cost-effective method). Reforestation or afforestation: $16/tCO₂e. Biomass burial: $111/tCO₂e. Biochar: $131/tCO₂e. Direct air carbon capture and storage: $715/tCO₂e. Direct ocean carbon capture and storage: $1,402/tCO₂e (the most expensive method). The infographic also features a graph showing the historical and projected growth in global carbon capture capacity from 2011 to 2035. In 2011, the capacity was 19 Mt/year, which is expected to triple to 52 Mt/year by 2023, and increase significantly to 1,180 Mt/year by 2035. Sources for the data are listed as "The State of Carbon Dioxide Removal 2024 (IIASA)" and "IDTechEx."
November 10, 2025 at 12:15 PM
davidho.bsky.social
I wanted to pet the dog
November 10, 2025 at 12:06 PM
davidho.bsky.social
Marine CO₂ removal lacks standardized indicators to quantify carbon removed and environmental impacts. This absence of reliable metrics prevents verification, inhibits investment, and blocks entry into carbon trading systems.

iopscience.iop.org/article/10.1...
a schematic diagram showing various processes and related indicators for monitoring carbon removal in ocean systems, based on analyzed literature. The diagram divides the processes into three categories represented by different colors: Blue Carbon (green): Focuses on processes related to carbon sequestration and the role of marine ecosystems in capturing and storing carbon. Artificial Upwelling (yellow): Depicts processes that involve artificial interventions in marine environments to increase carbon capture. Ocean Alkalinity Enhancement (blue): Illustrates methods that increase ocean alkalinity, which can help enhance carbon removal. The processes depicted in the diagram include: Carbon Sequestration Potential: This refers to the ability of oceans to capture and store carbon, with an indicator for monitoring this potential. Mineral Dissolution and Seawater Alkalinity Change: These processes are associated with changes in seawater chemistry, enhancing carbon sequestration through increased alkalinity. GHG Emissions: This represents the release of greenhouse gases, which can be measured to monitor the net carbon dynamics in the system. Carbon Removal Rates and Respiration: Shows how carbon is removed from the atmosphere and the role of respiration in this process, measured through carbon flux indicators. Primary Production and Water Masses Detection: This includes the detection of primary production (e.g., photosynthesis) in marine systems that leads to organic carbon formation. Sinking, Remineralization, and Burial: These processes involve the movement of carbon from the surface to deeper ocean layers, with some carbon remineralized and some buried in sediments. 🧪🌊
November 10, 2025 at 11:18 AM
davidho.bsky.social
The storied choice between socialism and barbarism was made exquisitely clear a good many years ago in the United States, and both major parties chose barbarism. 🫠
the storied choice between socialism and barbarism was made exquisitely clear a good many years ago in the United States, and both major parties chose barbarism. They are obviously and consequentially different barbarisms—one had reproductive freedom, vaccines, and trans health care in it, at least for a while—and I can tell you why I have sincerely preferred one to the other. But we oughtn’t to kid ourselves. From the perspective of a world of increasingly unimaginable maldistribution of resources, cascading ecological collapse, a genocide cheered on by a putatively liberal order, both are barbarisms.
November 10, 2025 at 11:04 AM
davidho.bsky.social
In Paris, you can get a monthly public transport pass for the city and its surroundings (Île-de-France) for less than 100€/month, and your employer has to reimburse at least half of it.

www.iledefrance-mobilites.fr/en/titres-et...
a detailed map of the Paris Metro and RER (Regional Express Network) system. The map is intricately designed with color-coded lines representing the different metro and suburban train routes, each labeled with their respective line numbers or names. The map is centered on Paris with the various lines radiating outwards, connecting numerous stations within the city and surrounding regions. It includes a legend for the metro, RER, and other transport systems such as tram lines. The map also indicates important landmarks, transit zones, and connections to other modes of transportation, such as buses and the Orlyval light rail to the Orly Airport. Each line has a unique color, making it easy to distinguish between routes.
November 10, 2025 at 10:55 AM
davidho.bsky.social
Since 1990, the emissions share of the richest 1% has increased by 13%, and the richest 0.1% has grown by 32%, while the poorest 50% has decreased by 3%.

policy-practice.oxfam.org/resources/cl...
A graphic poster with a green, textured background. At the center is a black-and-white image of Earth. Above the planet, a small private jet flies around the Earth, leaving a dark, tangled trail. Across the middle of the image, bold white text on black rectangles reads “CLIMATE PLUNDER.” Below, smaller white text states, “How a powerful few are locking the world into disaster.” In the bottom-right corner, the Oxfam logo and the word “OXFAM” appear in white.
November 10, 2025 at 9:01 AM
davidho.bsky.social
You can if you click the button for "Show Present Day Roads" at the bottom.
A digital map interface from a mapping tool called Itinere is displayed, showing a central section of Paris, France. The Seine River runs horizontally across the map, highlighted in blue with a lighter blue outline. Major streets and boulevards, such as Boulevard Saint-Michel, Boulevard du Port-Royal, Boulevard Diderot, Avenue des Gobelins, and Boulevard Raspail, are clearly labeled. Green areas represent parks, such as Jardin des Plantes and Esplanade des Invalides. In the top right corner, map coordinates (Longitude 2.370427, Latitude 48.851177) and zoom level (13.214) are shown, along with the text “Campagne à Paris.” At the bottom right, an orange toolbar includes icons for various map functions: zoom, selection, path drawing, and a highlighted button (circled in red) that appears to toggle visibility or layers. Additional control buttons for reset, rotation, and location tracking appear nearby. The top navigation bar of the interface includes the Itinere logo and links labeled “Documentation,” “Tutorials,” and “About.”
November 10, 2025 at 8:40 AM
davidho.bsky.social
LGA looks like a parking lot.
A map view of LaGuardia Airport (LGA) in New York City from a flight-tracking application. The map shows dozens of small yellow airplane icons positioned around the airport’s runways, taxiways, and terminals, indicating aircraft currently on the ground. Terminals A, B, and C are labeled, with Terminal B near the center and Terminal C toward the southeast. The surrounding areas include East Elmhurst and Vaughn College to the south, with Grand Central Parkway curving around the airport. The East River and Bowery Bay border the airport to the north and west, with Rikers Island Channel visible at the top of the image. A blue airport symbol with a white airplane icon marks LaGuardia Airport’s central location.
November 9, 2025 at 8:04 PM
davidho.bsky.social
Streets are for people
November 9, 2025 at 12:45 AM
davidho.bsky.social
What is the best resource for understanding what’s going on here?
Bunch of guys on the ground on a field from two different teams. Unclear what’s going on.
November 8, 2025 at 3:54 PM
davidho.bsky.social
Life goal
Two older men are riding penny-farthing bicycles—vintage-style bikes with large front wheels and small rear wheels—along a paved park path surrounded by green grass and autumn trees. The man on the left wears a black cap and suit and is pulling a small trailer carrying a small brown dog sitting in a basket with a wire dome cover. The man on the right wears a dark jacket and flat cap.
November 8, 2025 at 11:29 AM
davidho.bsky.social
I repaired my sweater today (jumper to those who speak traditional English).
The image shows a man sitting on a stool at a table, focused on sewing a piece of clothing. He is wearing a grey t-shirt with the words "I 🍅 HO FARMS" printed on it. The man is holding a dark brown sweater, using a needle and thread to repair it. He is in a community repair workshop. In the background, there is a chalkboard with the title "Institute of Making" at the top. The chalkboard includes a message encouraging people to visit local repair places, with several website URLs listed for repair services: * fixingfactory.org * therestartproject.org * communityrepairnetwork.org.uk * repaircafe.org The chalkboard also includes a suggestion to support local businesses such as dry cleaners, cobblers, phone shops, and bike repair shops. A coffee cup is placed on the table next to him, with a couple of chairs visible in the background.
November 7, 2025 at 9:43 PM
davidho.bsky.social
The meme makes itself.
The Oval Office with Donald Trump in a dark suit and red tie stands to the left with the label 'Trump (literally)' overlaid in red text. In the center and right of the image, several people in business attire are tending to someone who has passed out on the ground. A woman in a white blazer stands in the middle ground. The label 'America' appears in red text on the right side. The setting includes the Resolute Desk, presidential flags, military service flags, decorative curtains, and bronze statues.
November 7, 2025 at 6:28 PM
davidho.bsky.social
Q: What is a biogeochemist's favorite London cycleway?

A: C13, of course.
November 7, 2025 at 4:42 PM
davidho.bsky.social
Did women ruin elections…for the fascists?
A screenshot of a post on Twitter. The main post is by Scott Adams (@ScottAdamsSays) with a blue verification checkmark. His tweet says, “found the problem.” Below it, there’s a quoted tweet from Rachel Janfaza (@racheljanfaza), also with a blue checkmark. Her tweet reads: “Young women are the story of tonight. 81% for Mamdani in NYC 80% for Sherrill in NJ 78% for Spanberger in VA…” At the bottom of the image, engagement metrics are visible: 3,002 replies, 4,976 reposts, 45.4K likes, and 2.8M views.
November 7, 2025 at 8:28 AM
davidho.bsky.social
Bike shares are an awesome way to get around a city; even better when it’s an electric bike share. 😍
November 5, 2025 at 11:25 AM
davidho.bsky.social
The big excitement in Paris today is the opening of a fast fashion retail shop. There are news crews everywhere and lines out the door. So grim.
A busy street scene in Paris near the BHV Marais department store. The large beige stone building dominates the background with banners reading “SHEIN” and a prominent black-and-white advertisement featuring two people. Street signs point toward “Centre G. Pompidou” and “Sarbou.” Several people and cyclists cross the intersection while vehicles, including a white bus and van, move through. In the foreground, a small film crew is interviewing someone with a camera and microphone. To the right, there is a café named “Relais de l’Hôtel de Ville” with a red awning and glowing green pharmacy sign above it. The sky is partly cloudy, casting soft light on the historic architecture.
November 5, 2025 at 11:20 AM
davidho.bsky.social
The whole thing is mind-blowing, but this part at the end…
The same day as the attack, the FBI agents who signed the paperwork for the Mar-a-Lago search warrant were evacuated temporarily from their homes for their own safety. Documents with their names had begun to circulate online. The agents' identities had been redacted from filings on the court's website, but a copy of the original paperwork was left at Mar-a-Lago. FBI officials surmised that Trump's team had leaked their names, endangering the agents and their families.
November 4, 2025 at 8:32 AM
davidho.bsky.social
Streets are for people.
A street with two large painted figures on the pavement. Surrounding the street are neatly arranged plants and buildings on either side, with a cloudy sky visible above.
November 2, 2025 at 11:47 AM
davidho.bsky.social
Who can tell anymore if they’re moving furniture or robbing the place. 🤷🏻‍♂️
A delivery truck is parked on a street and there’s another vehicle with a mechanical lift extending towards a balcony of a building. A person is seen near the lift, while traffic cones are placed around the truck. The scene is set in an urban environment with trees and a cafe.
November 2, 2025 at 12:02 AM
davidho.bsky.social
Fixed!
Bottom of the zipper on a red bike jersey
November 1, 2025 at 11:18 AM
davidho.bsky.social
I'm all for small electric cargo delivery vehicles in cities but I don't think they should be in the cycle lane.
October 31, 2025 at 9:08 PM
davidho.bsky.social
Thankful for federal judges everyday.
• Food stamps: A federal judge ordered the Trump administration to use emergency funds to pay for food stamps during the federal shutdown. The Supplemental Nutrition Assistance Program, known as SNAP, aids roughly 42 million people and was set to run out of funds on Saturday without intervention.
October 31, 2025 at 6:29 PM