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"With “green corridors” that mimic the natural forest, the Colombian city is driving down temperatures — and could become five degrees cooler over the next few decades.

In the face of a rapidly heating planet, the City of Eternal Spring — nicknamed so thanks to its year-round temperate climate — has found a way to keep its cool.

Previously, Medellín had undergone years of rapid urban expansion, which led to a severe urban heat island effect — raising temperatures in the city to significantly higher than in the surrounding suburban and rural areas. Roads and other concrete infrastructure absorb and maintain the sun’s heat for much longer than green infrastructure.

“Medellín grew at the expense of green spaces and vegetation,” says Pilar Vargas, a forest engineer working for City Hall. “We built and built and built. There wasn’t a lot of thought about the impact on the climate. It became obvious that had to change.”

Efforts began in 2016 under Medellín’s then mayor, Federico Gutiérrez (who, after completing one term in 2019, was re-elected at the end of 2023). The city launched a new approach to its urban development — one that focused on people and plants.

The $16.3 million initiative led to the creation of 30 Green Corridors along the city’s roads and waterways, improving or producing more than 70 hectares of green space, which includes 20 kilometers of shaded routes with cycle lanes and pedestrian paths.

These plant and tree-filled spaces — which connect all sorts of green areas such as the curb strips, squares, parks, vertical gardens, sidewalks, and even some of the seven hills that surround the city — produce fresh, cooling air in the face of urban heat. The corridors are also designed to mimic a natural forest with levels of low, medium and high plants, including native and tropical plants, bamboo grasses and palm trees.

Heat-trapping infrastructure like metro stations and bridges has also been greened as part of the project and government buildings have been adorned with green roofs and vertical gardens to beat the heat. The first of those was installed at Medellín’s City Hall, where nearly 100,000 plants and 12 species span the 1,810 square meter surface.

“It’s like urban acupuncture,” says Paula Zapata, advisor for Medellín at C40 Cities, a global network of about 100 of the world’s leading mayors. “The city is making these small interventions that together act to make a big impact.”

At the launch of the project, 120,000 individual plants and 12,500 trees were added to roads and parks across the city. By 2021, the figure had reached 2.5 million plants and 880,000 trees. Each has been carefully chosen to maximize their impact.

“The technical team thought a lot about the species used. They selected endemic ones that have a functional use,” explains Zapata.

The 72 species of plants and trees selected provide food for wildlife, help biodiversity to spread and fight air pollution. A study, for example, identified Mangifera indica as the best among six plant species found in Medellín at absorbing PM2.5 pollution — particulate matter that can cause asthma, bronchitis and heart disease — and surviving in polluted areas due to its “biochemical and biological mechanisms.”

And the urban planting continues to this day.

The groundwork is carried out by 150 citizen-gardeners like Pineda, who come from disadvantaged and minority backgrounds, with the support of 15 specialized forest engineers. Pineda is now the leader of a team of seven other gardeners who attend to corridors all across the city, shifting depending on the current priorities...

“I’m completely in favor of the corridors,” says [Victoria Perez, another citizen-gardener], who grew up in a poor suburb in the city of 2.5 million people. “It really improves the quality of life here.”

Wilmar Jesus, a 48-year-old Afro-Colombian farmer on his first day of the job, is pleased about the project’s possibilities for his own future. “I want to learn more and become better,” he says. “This gives me the opportunity to advance myself.”

The project’s wider impacts are like a breath of fresh air. Medellín’s temperatures fell by 2°C in the first three years of the program, and officials expect a further decrease of 4 to 5C over the next few decades, even taking into account climate change. In turn, City Hall says this will minimize the need for energy-intensive air conditioning...

In addition, the project has had a significant impact on air pollution. Between 2016 and 2019, the level of PM2.5 fell significantly, and in turn the city’s morbidity rate from acute respiratory infections decreased from 159.8 to 95.3 per 1,000 people [Note: That means the city's rate of people getting sick with lung/throat/respiratory infections.]

There’s also been a 34.6 percent rise in cycling in the city, likely due to the new bike paths built for the project, and biodiversity studies show that wildlife is coming back — one sample of five Green Corridors identified 30 different species of butterfly.

Other cities are already taking note. Bogotá and Barranquilla have adopted similar plans, among other Colombian cities, and last year São Paulo, Brazil, the largest city in South America, began expanding its corridors after launching them in 2022.

“For sure, Green Corridors could work in many other places,” says Zapata."

-via Reasons to Be Cheerful, March 4, 2024

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When pioneer species are replaced by more specialised plants through the process of succession you might assume that they are enemies, with the latter driving out the former. However when you understand that the layer of soil formed by decomposing pioneers is what facilities the growth of other plants, you realise that they are actually kissing each other with tongue

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Mountain spirea

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Coastal bush lupine

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Since some people have asked me, if you're looking to pollinate your local pawpaws right now for future autumnal enjoyment, here's Cothron's guide. Depending on where you are, this needs to happen asap or within the next week or so.

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shoutout to this random-ass guy who had this incredibly rare bird sighting

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Sweet and savory spring pancakes with Allium oleraceum and candied spiderwort flowers.

I’ll include the recipe when I do my write up for @graveyarddirt ‘s hagging out.

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should i get into bird watching?

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A young man and his dog take in the view of Colonial Peak and Pyramid Peak from Sourdough Mountain.

Washington

1940

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Hey, would you be willing to elaborate on that "disappearance of the Anasazi is bs" thing? I've heard something like that before but don't know much about it and would be interested to learn more. Or just like point me to a paper or yt video or something if you don't want to explain right now? Thanks!

I’m traveling to an archaeology conference right now, so this sounds like a great way to spend my airport time! @aurpiment you were wondering too—

“Anasazi” is an archaeological name given to the ancestral Puebloan cultural group in the US Southwest. It’s a Diné (Navajo) term and Modern Pueblos don’t like it and find it othering, so current archaeological best practices is to call this cultural group Ancestral Puebloans. (This is politically complicated because the Diné and Apache nations and groups still prefer “Anasazi” because through cultural interaction, mixing, and migration they also have ancestry among those people and they object to their ancestry being linguistically excluded… demonyms! Politically fraught always!)

However. The difficulties of explaining how descendant communities want to call this group kind of immediately shows: there are descendant communities. The “Anasazi” are Ancestral Purbloans. They are the ancestors of the modern Pueblos.

The Ancestral Puebloans as a distinct cultural group defined by similar material culture aspects arose 1200-500 BCE, depending on what you consider core cultural traits, and we generally stop talking about “Ancestral Puebloan” around 1450 CE. These were a group of people who lived in northern Arizona and New Mexico, and southern Colorado and Utah—the “Four Corners” region. There were of course different Ancestral Pueblo groups, political organizations, and cultures over the centuries—Chaco Canyon, Mesa Verde, Kayenta, Tusayan, Ancestral Hopi—but they generally share some traits like religious sodality worship in subterranean circular kivas, residence in square adobe roomblocks around central plazas, maize farming practices, and styles of coil-and-scrape constructed black-on-white and black-on-red pottery.

The most famous Ancestral Pueblo/“Anasazi” sites are the Cliff Palace and associated cliff dwellings of Mesa Verde in southwestern Colorado:

When Europeans/Euro-Americans first found these majestic places, people had not been living in them for centuries. It was a big mystery to them—where did the people who built these cliff cities go? SURELY they were too complex and dramatic to have been built by the Native people who currently lived along the Rio Grande and cited these places as the homes of their ancestors!

So. Like so much else in American history: this mystery is like, 75% racism.

But WHY did the people of Mesa Verde all suddenly leave en masse in the late 1200s, depopulating the whole Mesa Verde region and moving south? That was a mystery. But now—between tree-ring climatological studies, extensive archaeology in this region, and actually listening to Pueblo people’s historical narratives—a lot of it is pretty well-understood. Anything archaeological is inherently, somewhat mysterious, because we have to make our best interpretations of often-scant remaining data, but it’s not some Big Mystery. There was a drought, and people moved south to settle along rivers.

There’s more to it than that—the 21-year drought from 1275-1296 went on unusually long, but it also came at a time when the attempted re-establishment of Chaco cultural organization at the confusingly-and-also-racist-assuption-ly-named Aztec Ruin in northern New Mexico was on the decline anyway, and the political situation of Mesa Verde caused instability and conflict with the extra drought pressures, and archaeologists still strenuously debate whether Athabaskans (ancestors of the Navajo and Apache) moved into the Four Corners region in this time or later, and whether that caused any push-out pressures…

But when I tell people I study Southwest archaeology, I still often hear, “Oh, isn’t it still a big mystery, what happened to the Anasazi? Didn’t they disappear?”

And the answer is. They didn’t disappear. Their descendants simply now live at Hopi, Zuni, Taos, Picuris, Acoma, Cochiti, Isleta, Jemez, Laguna, Nambé, Ohkay Owingeh, Pojoaque, Sandia, San Felipe, Santa Clara, San Ildefonso, Tamaya/Santa Ana, Kewa/Santo Domingo, Tesuque, Zia, and Ysleta del Sur. And/or married into Navajo and Apache groups. The Anasazi/Ancestral Puebloans didn’t disappear any more than you can say the Ancient Romans disappeared because the Coliseum is a ruin that’s not used anymore. And honestly, for the majority of archaeological mysteries about “disappearance,” this is the answer—the socio-political organization changed to something less obvious in the archaeological record, but the people didn’t disappear, they’re still there.

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catch me later..

camas and sea thrift down by the river

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Millions of Birds Now Migrating Safely Through Darkened Texas Cities After Successful Lights Out Campaign https://www.goodnewsnetwork.org/millions-of-birds-now-migrating-safely-through-darkened-texas-cities-after-successful-lights-out-campaign/

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"There are many different kinds of animals that we call natural enemies, all of which hunt the bugs that might harm your plants. Many might already be familiar faces, such as  lady beetles, spiders, lacewings, and dragonflies. These hunters catch their prey by chasing it down or waiting in ambush."

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