Posts Tagged ‘erosion’
I was wondering the other day how much human activity is altering the plant, erosion specifically was what got me looking into the subject. I mean, humans have converted vast amounts of forest and prairie into farmland or worse, and erosion rates must have gone up significantly over normal background rates of erosion. Well, turns out geologists have calculated that the global erosion rate is about 10 billion tons of sediment moved from mountains to sea every year. Since the onset of agriculture, this has risen to about 28 billion tons per year. And we also move tens of billions of other material around in the form of mining, concrete production, etc. There’s not any question that humans are now the dominant force shaping the very surface of the Earth by a huge margin. The numbers a so huge that geologists are seriously considering defining the human era as a whole new geological era, the Anthropocene Epoch.
Then there’s the impact of humans have on the atmosphere. Let’s look at volcanoes. Every year volcanoes erupt and dump copious amounts of CO2 and SO2 (sulphur dioxide) into the atmosphere. Humans? We dump about 100 times and five times respectively as much CO2 and SO2 into the atmosphere every year as volcanoes. This is not chicken scratch. In fact the amount of CO2 released by humans and absorbed by the oceans has increased ocean acidity by 25%. This is a huge increase, and has changed the geological processes on the ocean floor in ways we don’t begin to understand.
Let’s just look at it from an energy standpoint. The heat energy released by the Earth every year is well understood. It’s about 44 trillion watts a year. This is what powers volcanoes, earthquakes, and plate tectonics. Human activity is about 16 trillion watts per year. Yes, human energy output is now about 1/3 the energy output of the Earth itself! And if it keeps doubling every 34 years, the current rate of increase, by about 2060 humans will be generating more energy than the Earth! Puny my ass.
It gets worse. As CO2 builds up in the atmosphere it increases the greenhouse effect, IE it traps more of the Sun’s heat on the Earth, warming the crust, the oceans, and the air. If the CO2 in the atmosphere doubles, it will add about 1300 trillion watts of heat energy to the Earth every year! That’s about 28 times the energy the Earth generates every year. And we’re well on the way, humans have increased the CO2 in the atmosphere by about 40% so far with no end in sight. Humans are literally cooking the planet’s crust, atmosphere, and oceans. Literally.
And these are just the big picture items. Little picture items, though the term is misleading, include deforestation, habitat destruction, over-fishing, and groundwater depletion just to name a few. Then there’s the dizzying array of chemicals we make and dump. Any of these could fill volumes with their effects, at least their known effects. My point here is very simple, humans not only are having a huge impact on the nature of our planet, we have no clue what the end results of these will be.
We are deliberately and literally geoengineering our planet, our only planet, with little to no understanding of the long term consequences of our actions. This is why the aliens haven’t contacted us yet, and this is why I question the idea that humans are an intelligent species. We are transforming the globe in ways we don’t even begin to understand, in the name of greed, ideology, and religion.
This isn’t going to end well.
(The above image is a NASA image and is being used legally, essentially it’s a Public Domain image as long as it is used in such a way that does not imply that NASA is endorsing a product or service. NASA does not endorse Doug’s Darkworld. It’s the decline of the Aral Sea in central Asia, once the world’s fourth largest lake. It’s now about 10% of it’s former size, entirely due to human activity and the results have been catastrophic. Lastly, much of the information on this post came from Our effect on the earth is real: how we’re geo-engineering the planet.)