#EarthDay2020: Carbon 101

#EarthDay2020 ACE Recycling Blog Series

This blog is part of a series of blogs from ACE Recycling In recognition of the 50th Anniversary of Earth Day.  This series focuses on changes you can make to decrease your carbon footprint and help the environment.  These changes are intended to be user-friendly.  Being environmentally responsible has the added benefit of being healthier and more cost effective.  The goal is to create fun and engaging activities for the whole family.  Simple changes to our everyday lives have big impacts on our health and the health of our planet.  #EarthDay2020 #EarthRise2020 #ActsofGreen #ACERecyclingBlog #SmallChangesBigImpacts

In the first article of this series we will look at the carbon system as a whole.  This system is complex, and though I will attempt to simplify it, I suggest you use this article as a jumping off point to research more, as what is presented here is just the tip of the iceberg.  There are sources within the article that are worth looking at for more in-depth information.  Quintessential to understanding Earth’s cycles is the fact that nothing exists in a vacuum. That is to say that everything affects everything else.  It is impossible to alter the amount or composition of one thing, without altering another thing in some way.  It is very important to understand that us humans are a part of the system and are subject to the laws of nature.  Therefore, human activities affect all life on Earth. When we alter the path of a river, burn fuel, cut down a tree or build a road, there are consequences. The key to balance is understanding those consequences, good or bad, in the context of the “Big Picture”. Being a former teacher and general science nerd, I believe knowledge is power. To that end, understanding the “Big Picture” is the first step to making conscious, deliberate choices in our everyday lives to decrease our impact.  In the words of Nelson Mandela, “Education is the most powerful weapon we can use to change the world.” Understanding that our choices, from the car we drive to the meat we eat, affect everything else because we are part of this big, beautiful system we call Earth is the first step to creating balance.    

Carbon as a Greenhouse Gas

Earth is a closed system, much like a snow globe.  Our atmosphere acts like a shield, protecting us from harmful radiation, regulating our temperature and holding in essential things, like oxygen and water.  The only thing that can come and go, and must for life to exist, is energy in the form of light and heat (think the sun).  However, there are certain compounds that capture heat and hold onto it, keeping it from escaping into space.  This heat becomes trapped on Earth (hence the greenhouse analogy).  These compounds are referred to as greenhouse gases.  Water vapor (H2O), carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), chlorofluorocarbons (CFCs) and ozone (O3) are greenhouse gases. By burning fossil fuels (oil, natural gas, coal) humans are pulling carbon out of long-term storage and putting it back into circulation allowing it to capture heat that would have otherwise escaped. You put carbon into the atmosphere every time you start your car or turn on a light.  

Ultimately, through natural processes this carbon would have been released, though probably slowly over a long period of time.  It is the pace at which we are releasing it that is shifting the system so drastically. In the blink of an eye, in terms of the history of Earth, humans have been pulling massive amounts of carbon out of the ground. That being said, in that short time a lot has changed which is cause for alarm.  The warming trend over the last 50 years (about 0.13° C or 0.23° F per decade) is nearly twice that for the last 100 years.  But even more alarming is that we don’t really know the complex consequences of this drastic shift in atmospheric carbon concentration.  Science takes time, and quite frankly, all this is happening too fast for us to get a good grip on.  It would be prudent to slow down our carbon output until we fully understand the consequences of our actions.  

Natural Pathways

The elements on and within Earth exist in finite quantities.  This means that, the amount of any given element will remain the same.  That being said, elements can change form as a result of chemical reactions, temperature and/or pressure. Elements combine through chemical reactions to form various compounds, including water and minerals.  Regardless of their form they are trapped on Earth, in the ground, water, atmosphere or in living things.  These materials move through the environment, interacting with each other and responding to change, in predictable pathways.  For example, we understand that if water is heated up, it will evaporate and enter the atmosphere, once cool it will fall as rain or snow.  We call these pathways biogeochemical cycles.  Remember learning about the water cycle in school?  That is water’s biogeochemical cycle.   

The diagram shows the pathway water will take as it reacts to temperature and pressure changes on Earth. Along its path it will interact with other chemicals. https://i.pinimg.com/originals/b3/8c/74/b38c74dfe446bc3fcd4fa2fdc9f3ca6a.png

Generically, elements can be stored or they can be in circulation.  In storage, they are removed from the cycle and are not available to interact with other elements in the system, although they are still subject to temperature and pressure changes. In circulation, elements are actively interacting with the environment and each other.  Usually storage takes place because the material becomes trapped in Earth’s crust.  We call these materials minerals and find them valuable for many reasons.  An element in the atmosphere or (generally) water, is considered in circulation and becomes part of the billions of chemical reactions that take place on Earth every day.  Life stores elements, but on a shorter time scale than if they were underground. When the living thing dies, the elements it stores are released back into the environment and the cycle.

Natural Change, by Natural Forces

Throughout Earth’s history different elements have been more or less prevalent in circulation verses storage.  There was a time when carbon, in the form of carbon dioxide was more prevalent in the atmosphere then it is today and oxygen was scarce.  (Curious how scientists find out what atmospheric conditions were like millions of years ago?)  Plants evolved in this carbon dioxide rich environment and began pulling carbon dioxide out of the atmosphere and into their cells.  There, carbon was used to convert the sun’s energy into a form of energy (glucose) the plant could use to power itself.  A waste product of this chemical process is oxygen (lucky for us).  As carbon dioxide was pulled out of the atmosphere and oxygen was pumped in, the chemical make-up of the atmosphere changed.  Because everything affects everything else, this chemical change resulted in a change in the climate.

The chemical composition of our atmosphere is dynamic due to natural processes, like volcanic eruptions, decomposition, changes in Earth’s tilt and fires caused by lighting.  In most cases, these shifts in atmospheric chemical composition are small and therefore have small effects. But after what we would consider a catastrophic event, things change in an instant and have big effects. When change occurs slowly, life has time to adapt and adjust.  When change occurs quickly, as it is now, life cannot keep up with the changes and extinctions occur.  The most known example of this is the dinosaurs. After a catastrophic meteor strike, coupled with intense volcanic activity, 76% of all dinosaur species just ceased to exist. However, there have been five major mass extinctions in Earth’s history, all of which were a direct result of drastic changes in climate caused by a catastrophic event.

Long-Term Carbon Storage in Fossils

The footprint of chemical changes in the atmosphere can be seen in the analysis of the geochemical record held in Earth’s crust.  Studying the past, allows us to determine what will happen if a certain chemical is more or less prevalent in circulation.  Historically, when carbon dioxide levels in the atmosphere are high, temperatures are high. This is true because carbon is a greenhouse gas and traps heat.  When the dinosaurs roamed Earth, there was a lot of volcanic activity releasing massive amounts of carbon dioxide.  At that time there was no ice at the poles as there is now and average ocean temperatures were 95 degrees.  It was a tropical paradise on the coasts, complete with tree-sized ferns, but in-land there were massive barren deserts. It is during this time that the coal, natural gas and oil we use today was created.  Large plants and small photosynthesizing algae pulled in carbon dioxide from the atmosphere to create their own energy.  With the carbon locked in their cells, they died and were fossilized.  Today we call those dead organisms fossil fuels. We dig them up and burn them to release the energy they hold and generate power.  As a result, the carbon they have been storing underground for 65 million years is released and put back into circulation.  This is an artificial (human-made) carbon release at a pace that is unprecedented and will lead to unprecedented challenges for life on Earth.  This is equivalent to a meteor strike – huge changes in a small amount of time that are resulting in mass extinction (yes, we are currently in a mass extinction). 

The yellow line represents atmospheric carbon dioxide concentrations in parts per million for the past 800,000 years. The 2013 annual average concentration is the dashed line. The peaks and valleys in carbon dioxide levels follow the coming and going of ice ages (low CO2) and warmer interglacials (higher CO2). Graph by NOAA Climate.gov, based on EPICA Dome C data (Lüthi, D., et al., 2008) provided by NOAA NCDC Paleoclimatology Program. https://www.climate.gov/news-features/understanding-climate/2013-state-climate-carbon-dioxide-tops-400-ppm
The Most Powerful Force

It is a scientific fact that the climate is changing at an unprecedented pace and that it is caused by human activities, in the same way that it is a scientific fact that a pencil will fall to the floor when dropped.  The scientific foundation on which climate change sits, is the same foundation that medicine is grounded in. Science simply puts into words what occurs in the natural world, by gathering evidence and analyzing the data embedded in that evidence.

It is an unmistakable truth that humans have always had big impacts on Earth and therefore, life on Earth. We have continuously and drastically altered the environment around us, by damming rivers, building cities in swamps (Washington DC), flattening mountains and cutting down vegetation. Many of those impacts have resulted in positive consequences, but there are those that have negative consequences. Usually, the negative consequences are a direct result of our huge population (7.7 billion humans and counting). But our large population can be a positive. Two heads are better than one, right? We need to band together to innovate and create a solution that has resounding positive consequences.  This communal problem solving is uniquely human and one of the most powerful forces on Earth.  We have created civilizations from dirt, flying machines from metal forged in fire and the internet. The key is a focus on creating more of the positive consequences, while acknowledging the negative consequences. For any of this to happen humans must acknowledge our direct connection to the cycles on Earth. This cannot happen without first understanding that we are a part of these cycles, not the master of them or some force standing on the outside. The key to balance is understanding the “Big Picture”, in which we are a part of the whole. Science helps us place the small things into the context of the big picture by defining our role within the processes on Earth.

COMING UP NEXT IN THIS SERIES:

Carbon & Us: A look at the current impact of carbon on humans

Your Carbon Footprint: A look at what a carbon footprint is and how to calculate and reduce yours in fun, family-friendly ways.

Author: Shelby Maguire

Shelby earned a bachelor's degree at Lake Erie College in biology and a master's degree in education at Ursuline College, both in her home state of Ohio. She currently lives in Phoenix, AZ where she was a high school science teacher for 10 years. She left the classroom to run ACE Recycling with her husband, but is an advocate for education and a life-long learner. She is passionate about science and works to educate the general public about science, specifically environmental issues. She is a self-proclaimed science nerd who loves research. She and her husband John, have three small children.

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