Aquatic methane is emerging as a primary cause of climate change
During the Great Permian Extinction Event, the planet’s temperature increased by 10 degrees centigrade. Even that doesn’t sound like an unbearable number, until you add it up. Take a not-untypical summer day, where the thermostat reads 39C / 102F. Simple addition puts you at 49C /120F. Even prodigious zucchini won’t come through that heat.
Coral doesn’t either. It dies off at around 101F. Only the most resilient species passes such a temperature swing off as “just another heat wave.” We humans are versatile and resilient. We live on every continent. We might as well be the ubiquitous cockroach, for our adaptability. A government trapper I met once predicted that at the end of this current extinction event there would be three critters interfacing on some bald knob…cockroaches, coyotes, and human beings. If there’s a fourth, I vote for zucchini!
| Cyanobacteria and bio-slime are even more resilient than our knob denizens, however. They were probably here at the very beginnings of life on this planet. They’re here now too, in spades. They are perfectly suited for survival under duress. |
Humans try to control bio-slime. Hammering it with toxic chemicals is a preferred approach. And sure, the poison kills it. But then it settles onto the bottom of the waterway, providing feedstock for methanogens, that generate methane. This is perfect, for the cyanobacteria. It cycles into more climate warming, as methane is 81 times more effective than regular carbon dioxide. Talk about shooting yourself in the foot!
Here’s an interesting tidbit. If the waterway being treated doesn’t have quite enough copper in its diet, instead of producing methane, such systems instead generate nitrous oxide. Laughing gas, which dwarfs methane’s impact in terms of climate change. Think 300 times more impactful than carbon dioxide.
So here’s the good news…we know how to steward water gracefully. We actually have lots of examples of such stewardship. And no, it doesn’t include toxic chemical treatment.
| Food webs can be energized. They can cycle all those extra nutrients into higher-order life forms than cyanobacteria, given an appropriate stewardship nudge. This usually takes the form of dissolved oxygen. Not a big deal. Not that hard. Just good design work. |
Fresh water will be the first habitat to succumb to poor stewardship. It is essentially the transition habitat between terrestrial and marine life. The bad news is that it is extremely vulnerable to degradation. The good news is that it responds to graceful stewardship quickly.
Even though fresh water only covers 6% of Gaia’s surface, it is a marker for how we humans are doing. If it is healthy, so are we. If instead it’s been allowed to degrade into nothing other than a methane factory, it will presage our demise.
Today methane accounts for 13% of greenhouse gas impact. As the algae maps indicate, we’d best get on the stick!