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Global Warming Worse Than Thought
yulek writes "This AP article summarizes the IPCC report released today which states that global temperatures will rise as much as 5.8 degrees instead of the 3.5 degrees (C) originally estimated for the period between 1990 and 2100. The U.S. is still the primary culprit responsible for 25% of climate affecting pollution."
A good example is the process of hydrodesulfurization (HDS). Sulfur is a natural component of crude oil; gas that is burnt with sulfur in it will produce sulfur dioxide, which, of course, is bad as it helps with smog creation. In addition, sulfur is what causes most cat converters to degrade, and if/when we go to fuel cells, sulfur will completely ruin the typical fuel cell catalyst (platinum based).
So the process of HDS removes sulfur from the crude oil to create hydrogen sulfide and clean hydrocarbons; in this form, it's easy to extract the hydrogen sulfide and convert it separately to a non-toxic/hazardous waste form. The problem is is that the sulfur is buried deep in the molecules of hydrocarbon, and to remove these sulfurs will generally destroy the hydrocarbon into smaller pieces.
Now we base our gasoline ratings on octane number, which is a combination of how large the hydrocarbons are and how many are olefins (double bonds) or not; a large number of long-chained hydrocarbons or olefins increases the octane number. If you try to remove all the sulfur before you distribute the gas, the octane number will drop terribly, and the gas will be worse than with the sulfur in it, as there's a better chance of CO production and reduced feul efficiency from low octane gas. So there's a practical balance between the effective sulfur removal levels, and the quality of gasoline that we get.
Mind you, as we head towards feul cells that can use methanol or ethanol as produced by bioproducts as opposed to crude, the amount of sulfur to start with will be much lower, and octane number will not be as great; you still need to deal with it, but you don't really have to worry that much about how much fragmentation of the hydrocarbon that you get.
Now, IMO, most of the problem with Global Warming is not a result of the last 20 years, but of the first 40 years of the 20th century with the unfettered industrial revolution and two wars that introduced aircraft to the world. Since at least 1960, we've been aware of environmental damage, and while it may have not been a consumer issue until the 1980s, we as scientists and engineers were already aware of it and layed the groundwork for what research is being done today to continually improve what we've got. I also think that we still don't have sufficient evidence to yet conclude if we are in a warming or cooling cycle for the planet, though I can't disagree that mankind has had a small effect.
"Pinky, you've left the lens cap of your mind on again." - P&TB
"I can see my house from here!" - ST:
I totally agree with you that nuclear is the way to go. I know some people will cry about Chernobyl, but that incident really just goes to show you the drawbacks of communism, not nuclear power. An intelligent reactor design (such as Candu) operated by well-trained individuals would never suffer such a catastrophe.
In the Candu design, if the reactor core starts to overheat, the heavy water moderator boils away, and the reaction stops. Simple physics prevents meltdowns. There are plenty of other good designs that avoid the Chernobyl problem, but people just freak out when they hear nuclear.
Another thing worth noting is that electric cars are a stupid idea if the electricity is generated by burning fossil fuels. Finally, your average coal plant puts out more radioactivity than your average nuclear plant (due to radioactive isotopes in the coal).
(I added the bold.)
Have a look at JunkScience.com for more on this.
My take is this:
We're being asked to believe an assertion by some people. They are trying to prove something that can't be observed, because it hasn't happened yet, can't be reliably seen to be happening, and has been repeatedly exploited, exaggerated, lied about, and then coined into gold by political extremists.
Perhaps some skepticism is in order.
and the US starts to really work on reducing emissions. We need to really work on fuel efficiency and more importantly we need to start research again on nuclear power. The current attitude towards nuclear power is ridiculous. It is the only currently viable high-energy source we have that doesn't pollute as badly as alternatives like coal. We also need to start working on retrofitting all coal-fired power plants in order to reduce emissions there. These things are common sense. Lets hope the new US leadership understands.
My blog: http://jkratz.dyndns.org/~jason/blog/
As a Minnesotan, I'm trying to figure the downside to global warming. Winters will continue to be a little warmer: yeah! Summers warmer: spend more time at the lake, or reading slashdot at my air-conditioned workplace. Icecap melts; oceans rise; Wash. D.C., New York and other coastal cities, as well as all of Florida is flooded: less gov't, faster election results, and NYC is like Venice. Cool!
Do yourself a favour and read Billions and Billions by Carl Sagan. In there, he talks about global warming in great depth and you'll understand then, why you cannot just disperse fine particulate matter (or even ozone) into the upper atmosphere to fix the problem. The real solution is to get our damn greenhouse emissions in order...then let the earth heal itself. But seriously, read this book...
Secondly, during the 60s, people worried about a global cooldown. It was similar to the worry about global warming now, only the reverse. As we know now, this didn't happen.
Third, global temperature depends on where you measure temperature. If I measure temperature in the middle of the city, it will go way up as the city increases in size and population. If I measure it in the country, it's not going to increase. Statistics lie, that's what they're good for.
Lastly, scientists don't agree on global warming. There was a similar conference earlier this year where scientists decided that they couldn't come up with a solid decision on global warming.
Don't let allow bad science to impede your rights!
Sheepdot: Open Source good, Closed Source baaaaaaad!
"Two South Pacific islands have disappeared beneath the waves, as climate change raises sea levels to new heights.
They are Tebua Tarawa and Abanuea - which ironically means "the beach which is long-lasting" - in the island state of Kiribati"
That's from the BBC
One thing I've found interesting is the level of disconnect between cause and effect in the US. The average American produces 70 times the level of pollution as the average person in a developing country, but most Americans I talk to never realise the damage they cause because they never see it . For instance, DDT is banned in the US as a toxic chemical, but it's exported for household use to developing nations.
If you only looked at the facts from an unbiased perspective, and actually had some contact with those who suffer the brunt of these damages, trust me, your opinion would be different.
Another thing I find interesting is that most Americans seem to get their opinion about scientific issues such as global warming and evolution from politicians and talk show hosts. The topmost post on this page is a guy quoting Rush Limbaugh on how volcanoes are more polluting than anything humans ever made (and it's been moderated up to 5). Guys....these people aren't educated enough to barely understand these topics, let alone form an opinion or explain it to others. Don't follow them like sheep. Columnists, politicians, left-wing and right-wing ideologues have agendas and try to sway your mind. Trust them as much as you would their expert knowledge on how to partition your HD for optimum seek times.
For issues on science, the best people to refer to are *scientists*. Yes, they are sometimes wrong, and they have competing theories, but they are heaps better and more reliable than anybody else, because they do it for a living and have to prove things more accurately and with greater impact on their lives than anybody else who talks about these things.
But then, judging by the wise posts in response to the article, what would scientists know....
I think a few clarifications need to be made here and for some of the messages further down:
(1) CFCs have almost nothing to do with global warming. They are the main cause of ozone depletion, which is a different problem. Ozone depletion allows more ultraviolet light to reach the Earth's surface. The most commonly cited threat from ozone depletion is a rise in skin cancer.
Global warming (a different problem) is caused by a buildup of greenhouse gases in the atmosphere, which trap solar heat reflected from the earth, and send it back down again, raising the planet's average temperature. The most commonly cited threat from global warming is a rise in sea level. But there are other scary problems. The one that I worry about is the fact that global warming could shift lots of climate bands hundreds of miles toward the poles. Existing ecosystems are built around the current temperature regimes -- forests and other ecosystems simply can't move as fast as the climate bands will shift, and they could be gradually weakened or killed off.
(2) This is not "bogus science." The Intergovernmental Panel on Climate Change is the single most authoritative source on this topic. They were established with the blessing of most world governments and with the mandate to come up with a genuine scientific consensus on the issue of climate change. They started in the early '90s with meek statements about the possibility of human-induced climate change, and have gradually become more decisive as more evidence has accumulated. The most important thing about this report is not the exact numbers that they are estimating, but the fact that most of the world's scientists who know anything about the topic (including a number of former skeptics) now believe that the evidence shows beyond a reasonable doubt that humans are causing global warming which is clearly distinct from the Earth's natural variation. You can always find some scientists (and more often pseudoscientists) who will disagree, but they are now a slim minority.