wilderness

After water, concrete is the most widely used substance on the planet. But its benefits mask enormous dangers to the planet, to human health – and to culture itself

Taking in all stages of production, concrete is said to be responsible for 4-8% of the world’s CO2. Among materials, only coal, oil and gas are a greater source of greenhouse gases. Half of concrete’s CO2 emissions are created during the manufacture of clinker, the most-energy intensive part of the cement-making process.

But other environmental impacts are far less well understood. Concrete is a thirsty behemoth, sucking up almost a 10th of the world’s industrial water use. This often strains supplies for drinking and irrigation, because 75% of this consumption is in drought and water-stressed regions. In cities, concrete also adds to the heat-island effect by absorbing the warmth of the sun and trapping gases from car exhausts and air-conditioner units – though it is, at least, better than darker asphalt.

It also worsens the problem of silicosis and other respiratory diseases. The dust from wind-blown stocks and mixers contributes as much as 10% of the coarse particulate matter that chokes Delhi, where researchers found in 2015that the air pollution index at all of the 19 biggest construction sites exceeded safe levels by at least three times. Limestone quarries and cement factories are also often pollution sources, along with the trucks that ferry materials between them and building sites. At this scale, even the acquisition of sand can be catastrophic – destroying so many of the world’s beaches and river courses that this form of mining is now increasingly run by organised crime gangs and associated with murderous violence.

Concrete can take our civilisation upwards, up to 163 storeys high in the case of the Burj Khalifa skyscraper in Dubai, creating living space out of the air. But it also pushes the human footprint outwards, sprawling across fertile topsoil and choking habitats. The biodiversity crisis – which many scientists believe to be as much of a threat as climate chaos – is driven primarily by the conversion of wilderness to agriculture, industrial estates and residential blocks.

.. But that was lightweight compared to what is now happening in China, the concrete superpower of the 21st century and the greatest illustration of how the material transforms a culture (a civilisation intertwined with nature) into an economy (a production unit obsessed by GDP statistics). Beijing’s extraordinarily rapid rise from developing nation to superpower-in-waiting has required mountains of cement, beaches of sand and lakes of water. The speed at which these materials are being mixed is perhaps the most astonishing statistic of the modern age: since 2003, China has poured more cement every three years than the US managed in the entire 20th century.

Today, China uses almost half the world’s concrete. The property sector – roads, bridges, railways, urban development and other cement-and-steel projects – accounted for a third of its economy’s expansion in 2017. Every major city has a floor-sized scale model of urban development plans that has to be constantly updated as small white plastic models are turned into mega-malls, housing complexes and concrete towers.

Empty, crumbling structures are not just an eyesore, but a drain on the economy and a waste of productive land. Ever greater construction requires ever more cement and steel factories, discharging ever more pollution and carbon dioxide. As the Chinese landscape architect Yu Kongjian has pointed out, it also suffocates the ecosystems – fertile soil, self-cleansing streams, storm-resisting mangrove swamps, flood-preventing forests – on which human beings ultimately depend. It is a threat to what he calls “eco-security”.

Trump is unusual in that he seems untouched by wilderness, by the awe and humility that comes from the encounter with nature. He only drives around golf courses, which, though sometimes lovely, are dominated, artificial forms of nature.

.. According to one type, character was forged by tilling the land; according to another it was forged by being tested by the land; and in another it was formed by being cleansed by the land. These types wove together to form the American mythos.

The first ideal was the Steward. This is the small yeoman farmer and craftsman who lives close to the soil — self-reliant, upright, humble before creation and bonded to his local community.

.. The second ideal was the Pioneer. This is the person who pushes against the wilderness and develops skill, courage and virility. This is the daring innovator who ushers progress by venturing to the edge of the known.

.. The third ideal was the Elevated Spirit. This is the person who slips off the conformist materialism of commercial society and is both purified and enlarged by nature’s grandeur. This is John Muir in Yosemite, Ansel Adams in the Grand Canyon.

.. Most people say that most of America’s problems are pre-political. What’s needed is a revival of values, fraternity and a binding American story.

openpolitics.com

Concrete: the most destructive material on Earth

After water, concrete is the most widely used substance on the planet. But its benefits mask enormous dangers to the planet, to human health – and to culture itself

This American Land