This New York Times article suggests that reports about climate change rely on a technique called the availability cascade, which seeks to fix numerous, recent examples of climate change in people’s minds in order to convince them that global warming is a problem. Here’s a snippet:
Slow warming doesn’t make for memorable images on television or in people’s minds, so activists, journalists and scientists have looked to hurricanes, wild fires and starving polar bears instead. They have used these images to start an “availability cascade,” a term coined by Timur Kuran, a professor of economics and law at the University of Southern California, and Cass R. Sunstein, a law professor at the University of Chicago.
The availability cascade is a self-perpetuating process: the more attention a danger gets, the more worried people become, leading to more news coverage and more fear. Once the images of Sept. 11 made terrorism seem a major threat, the press and the police lavished attention on potential new attacks and supposed plots. After Three Mile Island and “The China Syndrome,” minor malfunctions at nuclear power plants suddenly became newsworthy.
The “availability cascade” seems to combine the rhetorical notion of kairos (right timing) and a ubiquity topos–find a threat everywhere, and it seems more urgent to people and deserving of action. While I don’t think the “availability cascade” is anything new, it does seem to nicely capture the idea of momentum within rhetorical situations–the ways in which arguments and also affects are produced and gain force over time.
In other news, I was watching Ovation last night (they were showing a program called “Art or Not,” in which regular people and art experts weigh in on the merit of various artists, including this guy.
Anyway, there was definitely an “availability cascade” going on in terms of Ovation’s advertising, which featured at least one infomercial type product during every commercial break. Here are the top 4 most ridiculous ones I saw:
4) The AeroGarden.

Infomercials always want to show you how useful their products are by demonstrating multiple uses. Ever need to cut metal cans in half? Buy a Ginsu knife! The AeroGarden shows us that we can not only grow herbs, but also tomatoes and lettuce (or by extension, any other kind of vegetable, I’d guess).
3) The Listen Up personal sound amplifier, which allows you to “turn the volume up for yourself” on everything from church sermons to tv shows. But it’s not just for older people who are losing their hearing. In case your neighbors don’t think you are creepy enough already, you can also use it to eavesdrop on their conversations while you pretend to be checking your mail.
2) Napa Grape Lights, which you can use to create the perfect atmosphere for everything from gourmet dinners (create a centerpiece) to rockin’ parties (use the strobelight setting) to a romantic spa bath (string them around your tub).

1) Kinoki foot pads, which remove toxins from your body while you sleep:

The Kinoki foot pads infomercial makes the best use of the “availability cascade,” because it lists all the toxins found in the typical persons foot pad after use (mercury, lead, etc.) and shows people taking the pads off their feet to reveal a bunch of brown/black gunk on them (presumably, the toxins they have removed from their bodies). By showing the commercial, oh, every 20 minutes or so, Kinoki does a pretty good job of making gullible people think they can purify themselves of environmental hazards through their feet.