With another school year about to start, it’s a good time to reflect on the basic sciences: physics, chemistry and biology, and how important our understanding of them can be in dealing with what have become substantial threats to our existence.
A relatively small change in the mixture of gases that constitute our upper atmosphere has altered an obscure physical property known as its radiative transmissivity. The additional gases are the byproduct of the fossil fuel energy sources that have made our modern way of life possible. The result is that heat emanating from our planet that formerly passed into space is now being reflected back to Earth, resulting in a warmer planet. While this might sound benign, it’s is causing massive melting of polar ice, releasing tremendous amounts of moisture into the ocean and atmosphere, and dramatically altering our climate. That’s physics.
Synthetic fertilizers containing nitrogen, phosphorus and potassium, primarily produced from natural gas and ammonia, have powerfully enhanced our ability to grow food to feed our ever-increasing population. However, as soils have changed their composition in response this modified diet, their ability to hold moisture has lessened. This means that heavy rains produce runoff, allowing large amounts of these chemicals to be washed into streams, rivers and lakes, altering their composition and, in some cases, making the water unfit to drink. That’s chemistry.
Micro-organisms that survive by invading animal hosts in the wild sometimes evolve to live on human hosts as well. These new diseases can appear suddenly, as in the most recent Ebola outbreak, and given the speed and intensity which we now travel and interact, can also spread rapidly before any treatment or cure can be developed. Massive epidemics that can threaten the existence of entire populations are now increasingly possible. That’s biology.
These existential threats underscore the need for increased emphasis on the STEM (science, technology, engineering and math) disciplines that have been in decline here in the U.S. in recent decades. Click to continue reading »
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