Best Primer to Climate Change ever

The Beeb does it again. Best use of simple graphics to clearly explain science.

Gulf Stream

  1. Surface currents carry warm, salty water from the tropics.
  2. The water cools, its density increases and it sinks to the deep ocean.
  3. The cold water flows back to the equator, driving the “ocean conveyor” which in turn contributes to the Gulf Stream that warms northern Europe.
  4. As ice melts, freshwater dilutes the warm salty water from the tropics.
  5. The water becomes less dense so does not sink as fast, weakening the “conveyor” and therefore possibly disrupting the Gulf Stream.

Gulf Stream

Dramatic temperature shifts have happened in the past, driven partly by changes in a major ocean currents.

A “great ocean conveyor” helps transport heat around the globe via surface and deep-sea movements of water.

Scientists are exploring whether global warming might slow or shut it down – a scenario considered “low probability, high impact”.

This could disrupt mostly wind-driven surface currents such as the Gulf Stream, which brings milder weather to Northern Europe.

Low Probability, High impact indeed, aka the “Hell Freezes Over” Scenario. The Gulf Stream example is one of my favorites, check all the other animation out, it is great.

Similar Posts

  • Supreme Court to decide if CO2 is a “pollutant”

    Well, I am not sure if the Clean Air Act has all the right tools to regulate CO2, but the kind of vehicle-to-vehicle and plant-to-plant focus that the Clean Air Act brings could be a good starting point. If the court decides in favor of the states, and the EPA can get its rule making together, we can start seeing regulation in 5 years. I am not sure if this is early enough, and it is definitely insufficient. A “pollutant” as ubiquitous as CO2 needs a a comprehensive national and global policy effort even bigger than the Montreal Protocol to be effective. Kyoto was meant to be a starting point, but is stalled at the moment.

    Forcing motor vehicles to lower their emissions and increase efficiency is a no-brainer. If it takes the Clean Air Act to make this happen, I am all for it! But this will not really address the power plants that are the other huge contributor, most of the existing plants will be grandfathered in and as we know from previous experience, these grandaddies are bionic and immortal!

    Any chance that the Supreme Court will find in favor of this addition? I don’t think so. I predict 6-3 for the government on this one.

    Supreme Court to Hear Key Environment Case – New York Times

    WASHINGTON (AP) — The Supreme Court agreed Monday to consider whether the Bush administration must regulate carbon dioxide to combat global warming, setting up what could be one of the court’s most important decisions on the environment. A dozen states, a number of cities and various environmental groups asked the court to take up the case after a divided lower court ruled against them. They argue that the Environmental Protection Agency is obligated to limit carbon dioxide emissions from motor vehicles under the federal Clean Air Act because as the primary ”greenhouse” gas causing a warming of the earth, carbon dioxide is a pollutant.

  • King Coal Country Debates a Sacrilege, Gas Heat

    Hidden in the beginning of an article on a county heavily dependent on coal contemplating a switch to natural gas heating…

    “Heritage should account for something,” said James J. Rhoades, a Republican state senator from Schuylkill County.

    King Coal Country Debates a Sacrilege, Gas Heat – NYTimes.com

    Of course, this argument can be made to defend any practice including child marriage, the caste system, widow burning, slavery, genocide (the list goes on…). Coal is in august company.

    Some of the issues with anthracite:

    But what makes this brittle and lustrous rock, often known as black diamond, so hard and pure is that it is often deeper and under greater pressure than other forms of coal, which also explains why it is expensive and dangerous to extract.

    The anthracite mines in this area have seen more than 30,000 deaths since 1870.

    The argument about local jobs being lost and local economies being damaged is a valid one and needs to be addressed. In theory, destructive practices cannot be continued in order to prop up local economies. But decisions are made locally and it takes a lot of political courage to shutdown a destructive economy and possibly doom a town to fast death. I guess the solution is to provide alternative modes of economy and employment growth during the transition, easier said than done. Problem with being a one horse town, you better hope your horse stays forever young!

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    What's the matter with Canada?

    But beneath the calm exterior, Canada’s political system is in turmoil. Since 2004, a succession of unstable minority governments has led to a constant campaign frenzy, brutalizing Canada’s once-broad political consensus and producing a series of policies at odds with the country’s socially liberal, fiscally conservative identity. Canada is quietly becoming a political basket case, and this latest election may make things even worse.

    What’s the matter with Canada? – By Christopher Flavelle – Slate Magazine

    I don’t necessarily agree with the whole “basket case” assertion, it is a fundamentally strong country with a broad consensus on what the country should be.

    The current set of political parties is rewarding a minority set of policies (the conservatives) by fragmenting the majority centre-left of centre consensus between 4 different political parties, none of which will talk to each other. This is not exactly new, the conservatives only merged their parties a few years back.

    The liberals suffer from Dion’s non Englishness, he gets little traction from the English media (no idea about the French, I don’t know any). He’s not that charismatic, nor does he orate well in English, and so like the American election, it is all optics. The liberals also seem to have no understanding of what it takes to win a modern election. The conservatives get in the news all the time, their ads are all over TV, the liberals seem to be MIA.

    Harper on the other hand is “strong”, strength of course being defined as sounding decisive and declaratory, even though he usually just sounds alarmist and hyperbolic all the time. Somehow, this is interpreted as leadership. I guess the only good quality of leadership is being loud.

    Dion also made a gamble by selling something called the Green Shift, a carbon tax, to increase efficiency in energy consumption and reduce greenhouse gas emissions. Even though the tax is designed to increase efficiency in a country notorious for its very poor efficiency (27th among the 29 OECD countries in energy use/capita), it is being demonized as a tax that will destroy the country (just like every other environmental regulation destroyed every other country). It is also bad timing, as energy prices have soared recently, and Canada’s economy sputters to a halt due to falling resource prices and the American housing market bust (destroyed the BC lumber industry). The last thing people want to hear is “tax”, even though the middle class will get more than sufficient rebates to cover any tax increases. The liberals seem to have overplayed this hand. Elections are never won on environmental issues, too easy to attack.

    The conservative pitch thus far has only been to attack Dion while offering some incremental changes. But as Harper is flirting with a majority, this Toronto Star editorial asks the right questions.

    While Harper is presenting himself as a kinder, gentler Conservative these days, in the past, as a Reform MP, head of the National Citizens’ Coalition and leader of the Canadian Alliance (successor party to Reform), he staked out quite radical positions. He has called Canada “a northern European welfare state in the worst sense of the term,” has denounced the “moral nihilism” of the Liberals and the left for opposing the Iraq war, has suggested building a “firewall” around Alberta, and has called for “market reforms” for health care, “further deregulation and privatization,” and “elimination of corporate subsidies.”

    With a Conservative majority in sight, it is fair for Canadians to ask Harper whether he still holds these views and would implement them once in office. And if the answer is No, Harper should use the remaining four weeks of this election campaign to tell voters just what he would do with a majority.

    The media lets Harper get away with sounding “presidential”, his proposals are very vague, and that is worrying. It is clear, however, that from an environmental standpoint, he will be a disaster. A combination of a slowing economy and reduced social support programs (conservatives hate safety nets for regular people) will be bad for the not so well off Canadians. We shall see what happens in a few weeks.

  • Snakes in NY

    What fun, we saw three snakes hiking at the Turkey Mountain Nature Preserve in Westchester County, NY (the highest point in Westchester county, the information plaque claims that on a clear day, you can see the Manhattan skyline to the south). They were at different parts of the trail and we nearly stepped on them each time. They seemed in no hurry to escape and we got within a foot each time. Unfortunately, no camera except the cellphone, which is worse than no camera at all!

    There were a couple of really sluggish rat snakes

    Rat snake

    And there was a rather more active garter.

    Thamnophis_sirtalis_parietalis.jpg
    Memo to self: Take the camera wherever you go, this means you!

  • Canada's only proposed Carbon Targets in Danger

    Bill C-311, Canada’s Climate Change Accountability Act, is back in the “news” (no silly, not the media, who have more important things to worry about). I had written about this before the Copenhagen meeting. This bill sets Canada up with greenhouse gas emission reduction targets that would put Canada in a respectable mainstream position, 25% below 1990 levels by 2020, 80% below 1990 levels by 2050. But the Conservatives, in one of their classic legislative gambits, have forwarded the vote for April 14th, Wednesday. If the bill doesn’t pass here, it’s dead, and 4 years of countless committee readings, and multiple votes to pass would be wasted. And Canada will not have any climate change legislation whatsoever.

    Serious business, isn’t it? Climate Action has more, including what you need to do (I know, short notice, that’s apparently how important decisions get made around here).

    The Liberals hold the key. It was they who voted with the Conservatives the last time to scuttle the pre-Copenhagen vote. As of writing this post, no official word from the Liberals on their position.

    A call to Michael Ignatieff’s office, (613) 995-9364 gives me little hope of passage. I was told that the MPs had met, that Mr. Ignatieff would not be voting (apparently, because it’s a private member’s bill, leaders don’t vote, weird). Also, the official position of the party is that because it is a private member’s bill, that every MP would be free to vote on their “conscience”. Given that the Liberal party could not even defend women’s health in a recent whipped vote, I wonder where their conscience is on this.

    A call to David McGuinty’s (the Liberal Environmental Critic) Office, (613) 992-3269, elicited the rather helpful response that they would not be commenting on their stand till after the vote.

    Of our local MPs, both Denise Savoie (NDP) and Dr. Keith Martin (Liberal) will be voting to preserve the bill, they are on record saying this at a forum on climate change last week. Of course, Gary Lunn (Conservative) is not part of the equation here, pointless.

    So, call, call and call away, the Liberals need to hear about this. They don’t appear to understand the most basic rule of opposition politics, you get no points for supporting the government, except from pundits in the mainstream media. Only if you inflict some defeats on the government will the people of Canada take you seriously.

    David McGuinty – (613) 992-3269
    Michael Ignatieff – (613) 995-9364

    As always, remember that it is the Liberals that will be blamed for this bill’s demise, we all know the Conservative position on climate change. The NDP and Bloc Quebecois have voted repeatedly to pass this legislation. It is Michael Ignatieff’s Liberals who will stand in the way of Canada’s environmental progress.

  • Corn Can't Solve Our Problem – washingtonpost.com

    A must read for anyone who likes articulate scientists writing very approachable articles about important subjects!
    Corn Can’t Solve Our Problem – washingtonpost.com

    If every one of the 70 million acres on which corn was grown in 2006 was used for ethanol, the amount produced would displace only 12 percent of the U.S. gasoline market. Moreover, the “new” (non-fossil) energy gained would be very small — just 2.4 percent of the market. Car tune-ups and proper tire air pressure would save more energy.

    Proper tire pressure is not sexy, and does not lead to billions of dollars of profits!

    The net effect is that ethanol from corn grown in the Corn Belt does increase atmospheric greenhouse gases, and this increase is only about 15 percent less than the increase caused by an equivalent amount of gasoline

    Corn is such a boondongle, it’s amazing what the ADMs and Monsantos of the world can do.

    This means that when tropical woodland is cleared to produce sugar cane for ethanol, the greenhouse gas released is about 50 percent greater than what occurs from the production and use of the same amount of gasoline. And that statistic holds for at least two decades.

    Brazil will not solve all your problems (unless they’re samba related!). Increased demand for ethanol from Brazil could lead to clearcutting of the rain forest/other fallow grassland.

    Across the full process of growing high-diversity prairie hay, converting it into an energy source and using that energy, we found a net removal and storage of about a ton and a half of atmospheric carbon dioxide per acre. The net effect is that ethanol or synthetic gasoline produced from this grass on degraded land can provide energy that actually reduces atmospheric levels of carbon dioxide.

    It’s a very well written article.