While the effect of digital signage on the environment may be less than traditional signs, minimizing its impact requires being aware of factors like power consumption, and the use of hazardous materials.

Digital signage offers certain advantages from the standpoint of environmental protection over traditional printed signs, but that's not to say the digital medium isn't without its own set of environmental concerns.

Among the most serious are power consumption and the associated carbon footprint of producing the electricity needed to drive the displays and computers that feed them; the use of hazardous materials in the production of digital signage displays and computers; and the impact of display and computer disposal as well as that of the packing materials needed to ship the devices to their locations safely.

Display power consumption: On the display side of the equation, the growth of LED technology for backlights presents an alternative to fluorescents and has made it possible for display manufacturers to employ new power savings strategies, unavailable with fluorescent backlights, in an increasing number of panels. One such strategy is the use of Pulse Width Modulation, which can be used to vary LED power consumption and brightness. A simple way to evaluate energy efficiency is to get familiar with the government's ENERGY STAR program as relates to monitors. It's also wise in many applications to turn off individual digital signs or all the signs on a network after hours to save energy.

Digital signage player power consumption: The other power draw in a digital signage system is the player -typically a computer running dedicated software. Here, a few alternatives are possible to minimize power consumption, depending upon the application. Embedding the computer in the actual digital signage display can produce power savings -simply by eliminating an entire computer monitor and other redundant pieces of hardware, such as a second video card. Even if using an embedded computer is not possible, certain things can be done to minimize power consumption of a standalone system, such as replacing spinning disks with solid-state disks. SSDs also require less cooling, which can translate into power savings.

Hazardous substances: A couple of years ago, an article in New Scientist magazine based on research by a University of California-Irvine professor set off alarm bells in the press about NF3, a gas used in the production of LCD panels, solar panels and integrated circuits. According to the article, the gas has thousands of times the affect on the atmosphere as a comparable amount of carbon dioxide. But as a Columbia Journalism Review article said in August 2008, the media hyped the findings and distorted the impact of NF3 on the environment -mostly because of the small quantity of the gas being released into the atmosphere. The article quoted Michael Prather, the professor responsible study, as say: "It's not a big deal by itself," Prather said in an interview. "We're looking at less than half a percent [the impact] of CO2. Is it the most important thing? No. But it should be in the market basket. And it should be monitored."

Regardless, hazardous substances used in digital signage players (computers) and fluorescent backlights are legitimate concerns with the former using components with lead and cadmium content and the latter containing mercury. On the positive side, however, the European Union has established its RoHS (Restrictions of Hazardous Substances) directive restricting the use of six hazardous materials, including lead and cadmium. Further, California has enacted its own restrictions on the use of certain hazardous materials in electronics manufacturing. Such efforts have and will continue to make digital signage greener.

Disposal and waste: One way to minimize the impact of disposing digital signage components is to extend their lives. Doing things like choosing longer-life backlighting options, such as LED technology, and limiting monitors use to the time of day when, for example, a store is open or an air terminal is actually in use, can lengthen life. Additionally, donating old displays to charity not only can benefit worthy organizations but also keep panels in use and out of landfills. In fact, many communities will not accept monitors and computers as waste.

Finally, the fragility of monitors and computers makes proper packing material essential for safe transport. Asking about the use of recycled packing material and recycling that material after delivery of panels and players are also important for those wishing to make their digital signage installation as environmentally friendly as possible.

As I noted in my previous column, we are all powerless to put an end to the oil disaster in the Gulf of Mexico. But we are in control of our own actions, and to the best of our ability we can make our digital signage implementations a greener experience by being mindful of the environment as we plan our use of the technology.

The Christmas Day bombing attempt aboard a Detroit-bound airliner once again places into focus the importance of communicating warnings in times of emergencies.

It's easy to get complacent and drift from day to day without paying much attention to potential threats until an incident out of the blue slaps us across the face and demands we sit up and pay attention.

For many, the actions of Umar Farouk Abdul Mutallab, the man U.S. authorities say attempted to detonate an explosive device in his underwear, aboard Delta Airlines Flight 253 are such a wakeup call. The failed Christmas Day bombing came at a time when most people were focused on gathering for cherished family time and taking part in long-held holiday traditions. But with one news flash, those priorities, at least for a moment, were redirected into thoughts of safety and security.

Personally, beyond the typical reaction of most Americans to word of the failed effort, I could not help but think of the important role digital signage can play in delivering emergency alert messages.

Certainly, I'm not so wrapped up in digital signage that I think there's a place for 42in LCD panels and a digital signage network aboard an airliner. That's just silly. But what does come to mind is how businesses, educational institutions, stadiums and arenas, casinos, government agencies, the military and many others have taken steps to ensure emergency messaging via their digital signage networks as a component of their overall strategy for responding to a threat.

Consider these circumstances:
* Severe weather: Thunderstorms, tornados and other severe weather events can strike with little warning. In 2008, 125 people lost their lives in the United States due to tornados. Those in public places may have had a better chance of survival with adequate warning via digital signage.
* Fire: Public facilities with existing digital signage networks can add emergency fire information, such as escape routes, for use in the event of a blaze. The same signs also can deliver specific, vital communications from rescue workers to people in different parts of a building.
* Armed intrusion: Sadly, students and teachers periodically have been in the crosshairs of shooters at high schools and universities in the United States. Digital signage can warn of an intrusion and possibly direct people out of harms way.
* Military contingencies: Military bases with digital signage networks can tie the command structure into personnel scattered around the base via the signs as a supplement and backup to traditional military communications channels.

In each of these circumstances, digital signage can be used to convey important warnings, instructions on where to go, where not to go and what to do. Additionally, conveying emergency information via digital signs serves the needs of the hearing impaired and deaf. With digital signs, emergency alerts and messaging can be communicated quickly and effectively to those who otherwise might not realize a dangerous situation is unfolding.

For those businesses and institutions with existing digital signage networks in place, all that's needed to accommodate communicating during an emergency is a little forethought and planning. Often, a safety officer working for an organization will identify possible contingencies and the types of messages needed during such events. Canned digital signage slides with escape route maps, directions on where to proceed in a severe storm and other information can be prepared in advance and called up at a moment's notice when needed.

A digital signage network also can be built to allow authorized personnel in a public safety center, such as a campus police office, or even located anywhere with an Internet connection and password-protected access to take control of the network and create and display specific instructions on the fly.

The Christmas Day bombing attempt is a highly visible reminder that emergencies can occur at any moment. Responding to an emergency with vital information can mean the difference between life and death. Digital signage is an effective means to do just that.

Timeliness of messages and availability of your intended audience may be the most fundamental reasons digital signage is effective.

Two of the most basic reasons digital signage makes sense as a communications medium are its timeliness and availability.

In terms of timeliness, short of actually telling someone something face to face in a place of business, there may be no way to communicate more quickly with your co-workers, employees or customers than digital signage.

With digital signage, the time between actually conceiving a message and delivering it can be measured in seconds in many instances. When used properly, tapping into this extraordinary advantage means digital signage content will be fresh and relevant, both key factors in attracting and holding the attention of an audience.

When it comes to availability, digital signage may even have face-to-face communications in a business setting beat. Because the location of digital signs should be strategically chosen before a single message is ever created, they can be located where they are most available to their audience. For example, imagine a lunch room in a manufacturing plant, a break area in a mechanics shop, suspended from a ceiling above a production line. Each of these locations makes communicating some messages to employees much easier than finding an employee or group of workers and having face-to-face conversations.

Taken together, the timeliness of digital signage message and their availability to employees can be leveraged to improve productivity, enhance safety performance and even to boost sales.

I am familiar with one factory manager who regularly updates production figures on the company's digital signage network to inform his workforce about how well they are doing in meeting production targets. Given the ability of digital signage systems to tap into databases, it is possible for this manager to keep groups of workers apprised of their performance as data is updated in the database the company uses to track production.

Similarly, in some sales settings, digital signage is an effective way to encourage production, recognize performance and reward success in a public way that taps into the competitive nature of many sales people.

Customer service and support, too, can benefit from the addition of digital signs to help employees at a single glance keep track of wait times, percentage of problems resolved, open tickets and even customer satisfaction.

Businesses should also consider tapping into the timeliness and availability digital signage offers when it comes to safety. Not only can digital signage networks offer admonitions aimed at keeping the workplace safe, they also can be used to remind employees of their ongoing safety record.

Equally important in that regard is the ability of digital signs to offer timely emergency messaging to a workforce spread out through a factory or corporate campus. Potentially lifesaving warnings and emergency information can be communicated in seconds during severe storms and tornados and when other hazards may occur. Modern digital signage can even tap into public address systems to mirror an audible warning with visual emergency information. This can go a long way to meeting various disability requirements in work or public places.

There are many reasons digital signage makes sense as a communications medium, but none may be more fundamental than its ability to serve up timely information -be it production figures, customer service wait times or even warnings of a threatening storm- where that information is most available.

Digital signage offers advertisers and marketers the chance to reach consumers at the point of purchase via a medium that's powerful and appealing.

The latest figures from The Nielsen Company, the outfit that's best known for tracking TV watching and compiling viewership statistics known as ratings, reveal the number of dollars spent on advertising in the United States during the first nine months of 2009 declined 11.5 percent, a drop of $10.9 billion to $83.4 billion, compared to the same period the previous year.

To help put the decline in perspective, consider that this total exceeds by nearly $2 billion the approximate cost of a pair of Nimitz-class super aircraft carriers, like the USS Carl Vinson and the USS John C. Stennis. If the decline proves to have continued on pace in the fourth quarter, throw in another Nimitz-class carrier to visualize the annual decline for 2009. By the way, that's nearly a third of entire U.S. fleet of Nimitz-class carriers.

Hardest hit was the local Sunday supplement advertising category -down 48.3 percent compared to the first three quarters in 2008, Nielsen reported. But many other categories, including spot TV, local and national newspapers, network television, radio and local, national and B-2-B magazines, all suffered double digit declines in advertising spending.

Without question, the precipitous fall reflects the ongoing economic struggles in this country. Looking a little more carefully at the findings also reveals advertisers are reassessing where to spend their dollars. That's nowhere more apparent than in the continuing migration of advertisers away from print. According to Nielsen senior VP for new business development Terrie Brennan, local newspapers saw 12,000 fewer advertisers in their pages last year, while nine of 10 top cable TV categories saw increased ad spending.

Why would so many fewer advertisers spend their precious ad budgets in newspapers, while other advertisers embrace cable TV? One important reason is declining newspaper circulation. In October 2009, The New York Times online reported U.S. newspaper circulation fell 10 percent since the end of 2008. People reading fewer print newspapers turn to new media like the Internet and other traditional sources, such as cable TV.

The uptick in cable advertising also likely can be traced to the ability of cable channels to serve special interests, i.e. cooking, home improvement, movies, news, weather, etc., as well as that of cable operators to allow advertisers to target specific geographic areas of the cable service area.

Beyond these specifics, there's a more basic reason: tough economic circumstances focus the mind, sharpen thinking and force reassessment of spending. It appears from the numbers, that reassessing media selections comes down in favor of the popularity of video in a form that can be targeted to reach desired consumers.

This sort of reasoning is easily transferable to digital signage. It too makes use of all the appealing elements of television. It too can be used to target specific, desirable demographics. But unlike cable TV, digital signage also offers the added benefit of reaching shoppers at the point of purchase -or more accurately at the point where a buying decision is being made. Advertisers forced by the recession to sharpen their thinking and reassess media choices should keep in mind that more than 70 percent of consumer buying decisions are made at retail, according to the Point of Purchase Advertising Institute.

Albert Einstein is often quoted as saying that insanity is doing the same thing over and over again and expecting different results. Given today's economic climate, advertisers can no longer afford to make tried-and-true media choices. Declining budgets are forcing them to reassess their options in a bid to remain as effective as they have been in the past with fewer dollars to spend. Mindlessly remaking old media decisions would be insane, and ignoring how digital signage can help achieve desired goals would be downright crazy.