Exoplanets, or extrasolar planets, are simply planets that circle a star other than our own. First detected in the late 1980s, there are now thousands of known exoplanets. Although there is no current interest as a place to flee the ravages of our planet, the exoplanets are none the less of scientific interest.
The biggest problem as an escape route is the fact of distance, the nearest is over four light-years away. A light year is the distance light travels in one year or about six trillion miles. Despite being quite distant, the exoplanets are of interest as possible sources of other life in the universe. To accommodate life as we know it requires one universal – liquid water.
Water has unique chemical properties as a solvent that no other substance really can compare. Chemistry and thermodynamics, anywhere in the universe, combine in a way that makes life inconceivable without it.
With an abundance of water on this planet, one might think it is not an issue but increasingly it is. Specifically the availability of manageable water. Global warming and the climate change that follows therefrom is making the management of water difficult.
Sea levels are rising and rising faster than previously predicted. A recent study in the Proceedings of the National Academy of Sciences has suggested that the sea level rise may be as much as six feet by the end of the century, more than twice the prediction of just a few years ago. And lest you think the end of the century is a long way off, it is within the lifetime of someone who could be reading this column today.
Whole cities will either have to be abandoned or pay incredible costs for infrastructure to hold the seas back. Forty percent of the world’s population is coastal, that is live within fifty miles of a seacoast.
Meanwhile farther inland, managing water is being made more difficult. Billions of people around the world depend on meltwater from the mountain snowpack. The regions which include the western United States, Alpine Europe, Central Asia and downstream of the Himalayas and Tibetan Plateau contain nearly half the human population of the planet. Global warming is threatening the timely delivery of freshwater. More cold season runoff can overwhelm reservoir storage of water, making less water available later in the growing season.
We’ve recently had a lesson on water management with the historic flooding of the Arkansas River valley. Serious to catastrophic failure of levees is responsible for disaster declarations in a sixth of Arkansas Counties. Levees and other flood control structures will have to be not just replaced but radically upgraded to accommodate changing rainfall patterns.
At every turn, climatic instabilities force greater expenditures on infrastructure. This is the cost of climate inaction. The sooner we act to reduce the rate of global warming, the less we have to spend on mitigation. We have economically practical technologies to stop driving global warming. Wind and solar electric energy coupled with battery storage can power the world. We must wholeheartedly invest in the future, now. Or do we abandon our children to our unaddressed climate disasters?
Dr. Bob Allen, Ph.D., is Emeritus Professor of Chemistry at Arkansas Tech University.