This video is well worth 44 minutes of your time. Dr. Alley knows what he’s talking about, and he lays out the current understanding pretty clearly.
This video is well worth 44 minutes of your time. Dr. Alley knows what he’s talking about, and he lays out the current understanding pretty clearly.
One of the friendlier aspects of the planet we live on is the very slow speed at which conditions change. Over time, the continents drift about, and new mountain ranges or valleys are formed, and the oceans slosh around in response, but all of that takes far, far longer than the lifetime of any species, let alone any one organism. This means that life has time to adapt to the changes
The climate moves slowly too. When we learn about the ice ages, it seems like a lot happening in not much time. From a geological perspective, that’s true. There have been periods when the climate was relatively stable for many hundreds of thousands of years, but our recent ice ages – the ones our distant ancestors lived through – happened on a cycle lasting tens of thousands of years.
What’s interesting is that while an ice age, or an interglacial period, or a hot period can last for tens to hundreds of thousands or even millions of years, it takes far, far less time to get the climate rolling in a new direction. Huge, slow things tend to build up a lot of momentum, so once they get moving, they’re very hard to stop.
New research from the University of Wisconsin, Madison, looks at the long-term future of our climate, and compares the present with past climate changes. The results indicate something that many of us have long suspected: Even if we were to stop all fossil fuel use today, the planet would continue warming. Not only that, but the effects of what we’ve already done are likely to last 10,000 years or more.
I came to the realization some years ago that climate change was something I would be involved in for the rest of my life, but the reality is that it’s something that every organism on this planet will be involved in. This issue will not go away in our lifetimes, or our grandchildren’s lifetimes, or their great-grandchildren’s lifetimes. While we may have had an opportunity to prevent this future, that opportunity has been lost, barring some form of atmospheric carbon capture that works faster than the rate of increase from human activity, and from the numerous feedback loops that are already in action.
Of course, we can always make the problem worse – continued fossil fuel use, continued deforestation, and continued reckless farming methods could result in a much faster rise in temperature that would last much longer. There is no scenario in which it cannot get worse, up to the point where there’s no life left on the planet, so there will never be a point at which “we might as well give up” will be a legitimate argument.
But it is no longer enough to focus on reducing emissions. In reality, that hasn’t been enough for at least a decade. We need to reduce emissions, but we also need to prepare, if we want civilization to survive. We need to plan for a future in which the seas will not stop rising – not for hundreds, or thousands of years. We need to plan for a future in which farming conditions will never be reliable year to year, or decade to decade. We need to plan for a future in which diseases are no longer limited by the climates of different geographic regions.
Like it or not, we now live on an alien planet. It seems similar to the one that gave rise to our civilization, but it isn’t the same, and it will keep getting more different with the passage of time. The longer we avoid coming to terms with that fact, the more will be added to a death toll that is already climbing due to our actions.
It isn’t fair. Nobody in my generation chose this. A majority of “boomers” didn’t either. Not any more than they chose to be exposed to leaded gasoline or chose to be expose to cigarette smoke. And as much as I feel that I’ve been handed a problem that should have been solved before I was born, I’m one of the lucky ones. My country will do OK, overall. Provided we don’t start a nuclear war or something like that, we’ll do far, far better than the billions whose countries had no real role in creating this disaster, and the billions more who will be born too late to even remember when people were trying to prevent it.
I think that, as a species, we can weather this storm of our own making. I believe that we can, in coping with these changes, build a more resilient and just global society, and have a healthier relationship with the rest of life on Earth. We’ll have to, if we’re going to avoid extinction.
Like all those who have created or consumed post-apocalyptic entertainment, I can see many paths to a desolate future. I can also see many other futures, and they’re worth working towards. As a species, we have the power to build a future in which we surmount the obstacles placed before us by our elders, and to keep climbing to something better. There’s no easy path anymore – the easy path would have been to avoid this in the first place. But I can see futures worth working towards, and I think we need that right now.
Over the last couple decades, the world’s business and political leaders have gradually come to understand that climate change is something that cannot be ignored. Every year, the immediacy and severity of the problem have become clearer. Sea level rise, seasonal changes, and even evolutionary changes in response to the rise in planetary temperature have all made it clear that the entire planet is changing around us, and that ignoring it could have devastating results.
Living, as we do, in a society that values money so highly, some of the responses have been predictable. In particular, businesspeople like Bill Gates have been pushing
the idea of geoengineering as a solution. Geoengineering, in this context, is a catch-all phrase for deliberately tinkering with Earth’s climate and the mechanisms that affect it. The problem with this is that the term is so broad it’s almost useless. It can apply to things like planting more trees, and it can also apply to colossal structures in space to reduce incoming sunlight.
One of the most commonly discussed geoengineering solutions is iron fertilization of the ocean. The basic idea is simple – iron is a limiting nutrient in the ocean, so putting iron particles in the ocean will stimulate the growth of photosynthetic plankton, which will pull CO2 out of the atmosphere. The idea is that when the plankton die, a sizable amount of their mass will sink to the bottom of the ocean taking that carbon with it.
It’s not really clear how well this works in practice. Some studies have indicated that it would work, while others indicate that it might not have much effect, and some people have raised concerns that it might actually result in eutrophication and dead zones.
Newly published research now indicates that because iron is not the only low-availability nutrient in the ocean, the algal bloom from iron fertilization in one part of the ocean might pull other nutrients, like nitrates and phosphates, out of the water, starving plankton farther downstream along the oceanic currents.
It’s tempting to simply wave away geoengineering as a bad idea that we should bury and be done with. There are countless ways that it could go horribly wrong, especially when enacted by billionaires like Gates and his ilk, who have little to no understanding of the ecosystems with which they want to tamper. With the possible exception of planting more trees and creating more wild spaces (which would, without question, work), pretty much every proposal for geoengineering has the potential to have devastating side effects that could make life on Earth much more difficult.
There’s one compelling reason not to throw it away altogether. The reality is that we are already engaged in geoengineering, and there is no question that the path we’re currently on will end badly. Like it or not, humanity has become a force of nature. The size of our population and the scale of our technology mean that we exert a global influence of the chemical makeup of our planet’s oceans, atmosphere, land masses. Currently, we are engaged in the kind of geoengineering that Svante Arrhenius calculated was possible over a century ago – raising the planet’s temperature by increasing greenhouse gas concentrations.
For the sake of our own long-term survival, not to mention the rest of life on Earth, we need to come to terms with the fact that our species exerts a global influence, and we need to take deliberate control of that influence. We are already geoengineers, we’re just not taking responsibility for it. It’s past time to do more than simply work on reducing our fossil fuel use – we need to think about how we manage the surface of the planet we live on, and how we can manage it for the benefit of all life on Earth – ourselves included.
Because right now, we still seem to be pretending that we can just stop having a planetary impact, and with our population headed for 10 billion in just a couple decades, that is the one option that is no longer available to us.
A couple days ago, scientists at the University of Texas at Austin’s Institute for Geophysics published the first map of Greenland ice movement over time, and compared the current rates of ice movement to the historical trend.
Their basic finding is that the current rate of Greenland ice movement is slower than the average rate of the last 9,000 years. This is basically due to differences in Earth’s atmosphere over time:
During the last glacial period, higher rates of atmospheric dust deposition produced softer ice, which flowed more readily than cleaner ice. During most of the Holocene, though, atmospheric dust concentrations were lower, and the less-dusty ice that formed was stiffer, meaning it did not flow or thin so rapidly. Thus, the thickening seen today in the central regions of Greenland is partly a response to changes in ice rheology that occurred thousands of years ago.
Presumably this dust disparity doesn’t include the late 19th century leading into the 20th and 21st centuries.
This research – like a lot of climate research – can be a bit confusing to non-scientists. If you’ve paid attention to what sundry news sources have had to say about climate change and Greenland ice, you’ve probably gotten the impression that it’s not only melting, it’s also sliding into the ocean faster every year. That’s the impression I had, and it’s the impression the authors of this research had too:
“Like many others, I had in mind the ongoing dramatic retreat and speedup along the edges of the ice sheet, so I’d assumed that the interior was faster now too. But it wasn’t,”
Based on my experience in climate science communication, at some point the community of climate deniers will seize on this (with glee) as “part of a growing collection of evidence that things aren’t actually as the ‘warmists’ would have us believe”. And, to be honest, most advocates for climate action will probably ignore these findings, for the most part, because at first glance it seems like the deniers might have a point.
The problem is that we’re really good at taking “first glances” and really bad at getting the right impression from them, and as with much of science, this merits deeper discussion.
First of all, while the interior of Greenland is moving more slowly than it used to, the outer edges are moving much, much more quickly than they used to, and contributing to sea level rise. It is expected that as the edges of the Greenland ice sheet crumble into the ocean, and as temperatures continue to rise, the interior of the Greenland ice sheet will probably speed up again.
And that brings us to the second point. People of all stripes have a tendency to focus on research that supports the views they already hold, while discounting or ignoring anything that might challenge their beliefs. While they are not alone in doing this, the climate denial movement is particularly adept at it. They will take isolated bits and pieces, behave as though those bits and pieces are all of climate science.
The reality is that as long as greenhouse gas levels continue to rise, the planet’s temperature will also rise. That’s basic thermodynamics. If you increase the insulation around something, without reducing the amount of incoming heat, then it would be physically impossible for it not to warm.
The Earth’s temperature will continue to rise (and that includes both ocean and atmospheric temperatures) because we are continuing to add greenhouse gasses to the climate system. The rise in temperature has already led to rising sea levels and melting ice around the world, including Greenland. Higher temperatures will mean more melting. Again, that’s basic thermodynamics. This research shows that the changes in temperature and greenhouse gasses are not the only factors at work, and that’s good to know; but in the end, these data do not call the laws of thermodynamics into question.
There’s one more thing to mention about the deniers. A large part of their “case” rests on the notion that the scientific establishment is, in fact, suppressing or ignoring any evidence that might challenge the mainstream understanding of Earth’s climate. It’s a seductive message (there’s a reason there are so many conspiracy theorists out there), but one that is without merit. This is a clear example of a scientist going into his research with an expected finding (he thought he’d find accelerating ice movement), getting a result that was the opposite of what he expected, and reporting on it anyway, because for a majority of scientists, that’s just what you do.
Dishonesty is a factor in all human endeavors, and there are many examples of scientists fudging the numbers. It is important to note, however, that those lies are found out, usually by scientists, and that over time the record is corrected. The field of climate science is almost 200 years old, and for a majority of that time, we’ve known the thermal properties of CO2 and other greenhouse gases. We’ve also known that increasing those gases will cause Earth’s temperature to rise. Unless someone manages to produce and support research that undermines those basic facts, there is NO reason to think that Earth’s temperature will do anything other than rise, and keep on rising as long as our greenhouse gas emissions maintain a themal imbalance.
I’ll let Pippa get the last word on this –
With the so-called Arctic death spiral continuing apace, and methane seeping out of the melting permafrost, all signs point to an imminent acceleration of warming in the Arctic, and that means even faster melting of the greenland ice sheet.
This is not good news, and understanding what the effects of that melting will be is crucial to preparing for those effects.
The ones that I think are good take a fair amount of time to research and put together, and so I’m going to start pasting some of them here, both for my own future reference, and for the benefit of anybody who might find it useful.
I’ll post the comment I respond to, and the conversation thereafter, along with a link to the whole thread. Other people’s comments will be in a different color from mine.