Climate change requires us to think in new ways about how physical and human geographies intersect: how does the one impact the other? How do human artifacts built for one set of circumstances react to the change in conditions?
Simon Dixon notes on Geography Directions:
We are undeniably living in the age of humankind, the “Anthropocene”, but we are still coming to terms with what this means for the planet and for ourselves. Researchers and policy makers have begun to consider the social and environmental impacts of our increased urbanisation. There are also efforts to understand the impact human activity is having on the surface of the earth more broadly – for example, through the creation of anthropogenic landforms like open-cast mines, and by changing erosion processes in rivers through human activity. However, so far there has been little attention paid to the way earth surface processes are slowly altering and morphing the fabric of our cities to create new, startling and potentially dangerous features.
As his blog post illustrates, using the subject of urban sinkholes, climate change is also a fruitful area of research for geographers and social scientists, because these processes are also happening at/impacting human artifacts and structures. Remember the giant sinkhole in Japan late last year?
As this post was being written, the nightmare of Hurricane/Tropical Storm Harvey began to unfold, as did the unusually intense monsoon rains in South Asia. As it affects literally millions of people simultaneously, these events are an even more powerful reminder that physical and human geography intersect in ways that are increasingly unfamiliar.
Houston is a very flat city, as is explained in WorldView Software’s World Geography Case Study: Human Migration: Texas. Its prosperity has come from the way humans have modified this surface, with railroads, ship channels, and pavement. However, this makes it prone to flooding when its bayous cannot empty into the Gulf of Mexico. In a prophetic 2016 series, Pro Publica and the Texas Tribune teamed up to explain why Houston was going to be in dire straits sooner rather than later:
As millions have flocked to the metropolitan area in recent decades, local officials have largely snubbed stricter building regulations, allowing developers to pave over crucial acres of prairie land that once absorbed huge amounts of rainwater. That has led to an excess of floodwater during storms that chokes the city’s vast bayou network, drainage systems and two huge federally owned reservoirs, endangering many nearby homes…
This lack of zoning regulations is one of the factors that made Houston America’s fourth-largest city, attracting builders to the area. But zoning and environmental planning can be useful in a disaster: see WorldView Software’s Civics and U.S. Government Project: Environmental Impact Statements. As Ian Bogost writes in The Atlantic,
The natural system is very good at accepting rainfall. But when water hits pavement, it creates runoff immediately. That water has to go somewhere. So it flows wherever the grade takes it. To account for that runoff, people engineer systems to move the water away from where it is originally deposited, or to house it in situ, or even to reuse it. This process—the policy, planning, engineering, implementation, and maintenance of urban water systems—is called stormwater management.
On top of that, climate change enters into the picture when it raises the water temperature of the Gulf: higher temperatures make it easier for the air to contain more moisture and for storms to generate more power. For example, precipitation totals have demonstrably risen the past several decades in the North Atlantic.
The intersection of geographies raises many questions that your students will have to answer in their lifetimes. How would you deal with a disaster? Check out World Geography‘s Internet Project: The Devastation of Katrina for starting points on imagining yourself in a crisis. Because the sooner we start imagining the unimaginable, the safer we can make our future.
[See this list compiled by The New York Times for reputable organizations if you want to help the Harvey victims.]
Preview WorldView Software’s programs for free at http://www.worldviewsoftware.com/preview/