DrGray wrote:DryObserver wrote:Try painting all of the asphalt roofs and roads white, thereby changing the albedo for a substantial part of the Earth's surface (that is presently dark gray to black).
Yes, great idea! Perhaps if the deckhands had pulled out their paint cans to begin repainting all the deck chairs, the titanic would not have taken a detour to the sea floor.
Sorry for the sarcasm, but come on! If your going to spend that much energy on a project, at least do it for something worthwhile. Instead of painting the roads white, just turn them into bike paths. I know that won't happen, but neither will painting every city in the world white.
Mayor Michael Bloomberg of New York City was on Charlie Rose a few months ago with his top two environmental advisors. One of them commented that just by using my idea of painting the roof of a building white, they would save an average of 10 or 15% of the structure's annual electrical bill. (I've forgotten the precise number, but it was on that scale.) And remember, these are buildings in
New York City. Admittedly, New York suffers from a heck of a heat-island effect, but this is one of our more northern American cities.
Imagine, first, what the energy savings are for the typical New York skyscraper if it can save just 10% on its electrical bills in exchange for just painting its roof white... a relatively small part of its exposed surface area.
Then imagine what the economic and energy consequences would be at the core of much warmer industrial cities, especially if they painted the streets at the heart of their municipalities as well. To be blunt, this is cheap, and I never thought it would realize those kinds of saving that fast. But since it's a readily available tool, why not use it?
DrGray wrote:You might ask what's the harm in trying this white wash idea? It's pansy (bleep!) ideas like this that allow yuppies to feel good about themselves that they voted for something green, meanwhile consuming ever vaster quantities of energy. They did their good deed for the year, they helped protect the planet, now they can go back to their 72inch LCD TV's. Half-(bleep!) band-aid ideas hinder real work that could be done, because most people will always choose the easiest way to get something done. If they think they are doing something by buying a green product, they will. And then their done. Finito. Global warming problem solved. On to the next fad.
Look, if you follow what I've written, I'm obviously very much in favor of cutting emissions and even extracting as much excess carbon as possible from the atmosphere. In fact, I've laid out inexpensive, easily budgeted ways to get lots of fruit and nut trees planted as a means of reducing carbon as well as a long-term food source. And while I also support reducing our use of fossil fuels, peak oil and a possible crash of industrial civilization may accomplish that far faster than any program of change, much as I would prefer a less destructive option.
But scientists are talking about losing the summer sea ice in the Arctic -- all of it -- in
four years. "Summer" is basically the Arctic's six months of "daytime," when the sunlight is constant, and in which that continent-sized piece of ice reflects an immense amount of solar energy back out of our atmosphere. If it disappears during the polar day, that means dark, deep seawater will be absorbing most of that presently reflected sunlight instead.
Why is that a problem? Because that will not only further accelerate climate change, it will probably accelerate other processes that are accelerating climate change, such as the release of methane from defrosting Arctic tundra and from methane clathrates at the bottom of our oceans. (Methane is about 23 times as powerful a greenhouse gas as carbon dioxide.) Not to mention other details, like the meltdown of Greenland's icecap.
The latter would raise global sea levels by over 20 feet when completely melted. The former could trigger a rapid, runaway heat up of our atmosphere.
If we can radically reduce the amount of sunlight we are absorbing and re-radiating as heat in warmer regions, where solar energy hits us more directly, it could directly and rapidly impact this swiftly snowballing situation.
Or, alternatively, we could all die.
I would prefer the former of those two alternatives.
On the positive side, some less accepted theories such as a possible snap ice age following the failure of the North Atlantic Current, could interrupt such a runaway heating event and only kill most of the life in Europe and possibly the world, instead of virtually all of it.
So there is that.