As the world population grows, and as (hopefully) larger numbers of people move from deep poverty into better living situations, we have to deal with the build-up of toxins in the biosphere. (For a discussion of carrying capacity see the previous post). The old adage the solution to pollution is dilution has limits based on the size of the container and the amount of toxins. As we saw two posts ago, a simple calculus used by environmental engineering is
Mass rate of accumulation = mass rate of input – mass rate of output.
We have to keep this in mind because, for all intents and purposes, (the bleed-off from the troposphere being so slight), we need to treat Earth as a closed system, in which we need to avoid piling up toxins too fast for the natural ecosystems to mitigate in their regular, natural rates. If we surpass this natural rate of breakdown to useful components, then we have to find ways to mitigate/ break down the toxins ourselves. For Christians with a biblical theology, this should be a conversation they deem important.
One of those things we are building up at a faster mass rate of input than the biosphere is handling, is heat. The amount of carbon being piled up in the upper atmosphere, acting with a greenhouse effect, is increasing the temperature in our world. Although Glenn Beck and Rush Limbaugh have convinced huge numbers of Americans that this isn’t really happening, every government in the world is scrambling trying to draw up plans to deal with this climate change. They are scared to death at what it means for crop failure, and nations with large coastal populations in low elevations see the writing on the wall. (Some South Pacific islands no longer have human populations, they’ve had to leave as their island is no longer above sea level – this is what happens when glaciers melt at the rate they are.) You can read about how the various gasses interact and feedback on NASA’s website here http://climate.nasa.gov/causes/.
The oceans are a telltale for the mass rate of input, in terms of heat, changing things about our planet. Ocean temperatures right now are breaking all historical records. Summer of 2014 was the highest ever recorded (Axel Timmermann, professor of Oceanography, U. of Hawaii). The Atlantic’s surface temps are now 3 degrees hotter than 30 years ago. NOAA reports that fish species are moving north and south away from the tropics, pushed by the change in temps. Inuit tribes north of Alaska do not have a word in their language for salmon, as they’ve never seen one. Until now. Half of the 36 species of fish we eat for food have shifted northward and further offshore in the last four decades, some no longer found in U.S. waters. When one species moves (due to temps) and their whole ecological food chain doesn’t move with them, disasterous population crashes can occur. Fishery managers are seeing alarming results of this kind of thing, and fearing it is going to get far worse. Widespread failures in cod reproduction have already occurred. A 20% crash in worldwide tuna harvest in the visible future. If anyone wants to argue heat isn’t building up faster than the planet deals with it, simply speak with an oceanographer or saltwater fisheries scientist. We need to be serious in considering this heat build-up if we want thriving oceans with stable, healthy ecosystems we can fish. Christians, who believe the Creator instructed humanity to steward, rule over, and care for this planet, have a moral obligation inherent in our faith to care about this subject, and go beyond taking the word of talented radio entertainers.
Sources: NOAA, Scripps Institute, Helmholtz Center for Ocean Research (Germany), James Cook University (Australia), National Marine Fisheries Service, Indian Institute for Tropical Meteorology, University of British Columbia, the Lawrence Livermore National Laboratory, Jason Schratwieser/ Sportfishing July/August 2016