…the extinction horrors of climate change may be a “fish story”
Perhaps the myth-iest chestnut in the scary global warming meme is that our dear earth’s panoply of species is adapted only to the current climatic regime, and changing that regime means certain death, i.e. extinction.
That’s an easy, simplistic sell, but it denies some of the subtleties of organismal biology. Four decades ago, scientists realized that evolution has preserved a variety of responses to environmental change. It turns out that our enzymes, the basic material that catalyze life as we know it, actually change their shape as climate changes. Whether this is because we have so much information stored in our DNA that has survived countless generations and a variety of climates, or whether the response is simply built into the enzymes is unknown, but it is ubiquitous. It even has a catchy name: “Phenotypic Plasticity.”
Before your eyes glaze over, a little explanation is in order.
Each one of us has a genotype, which is our DNA, and each of us has an expression of that, our “phenotype.” Obviously not all genes express themselves—if they did, our physiological destiny would be eminently predictable, but it is not. Instead, we all carry strands of DNA that could theoretically cause major disease that generally do not express (or “penetrate” in the lingo of biology), and we also have DNA that could probably defeat many of the aging processes, that similarly do not express.
Instead, organisms display “plastic” responses when their environment changes. And so, species-related concerns over potential CO2-induced global warming may be dramatically overblown. And, though they don’t get much publicity, scientists are continually documenting our amazing adaptability.