<FONT face="Default Sans Serif,Verdana,Arial,Helvetica,sans-serif" size=2><div><font color="#990099"></font>To add to what other's have said:<br><br>I think you have to consider that purchasing new equipment may not be that effective. Early retirement of systems adds to the waste problem and causes energy to be spent manufacturing the new equipment. So consider the waste aspect before you replace equipment.<br><br>Without replacing equipment there are some simple things you can do:<br><br>You should look into power management on your systems. Having your PC and monitor go to sleep when you aren't using them will save power. The CPU is one of the biggest draws on power on a PC so there is potential for big gains there. Choosing low powered CPUs when purchasing and using CPU scaling while running will help. It also stands to reason that paring back uneeded CPU hogging processes might help, but unless you have a real hog it probably won't matter much.<br><br>Powering off your systems at night will also save. Even off, these devices use power and so putting it on a power bar and cutting power at night may save those small bits of energy.<br><br>If you want to quantify the costs, google for "Watts Up" devices for monitoring power usage. Canadian Tire sold a competing product.<br><br>Now, if you're thinking of buying new equipment there are other options. Some of these may be a lot of work for minor gains but I thought I would include them in case you were passionate about this.<br><br>One consideration is to use some of the low power devices. We've all heard the term netbook by now, some are touting a "nettop", those are the small devices like these http://en.wikipedia.org/wiki/Nettop that use less power and space but replace a desktop PC.<br><br>You can also consider consolidation. Why run two desktops when you can both use the same PC simultaneously. This is almost as straightforward as it seems but expect some issues (e.g. many apps won't run two instances under the same UID: OOffice, Firefox). Use a Wyse WinTerm (the S50 model runs Linux) or Userful http://www.userful.com/ to add the second desktop. I expect there may be other ways of doing this as well.<br><br>Using virtualization for handling Windows apps is probably the best way. Wine and CodeWeavers can be challenging and I've found that so few apps that we use work on it that we've settled for virtualization. Wine is always getting better and if you have a short list of applications you need to run it's worth checking out the list of working apps at http://www.winehq.org.<br><br>I've also heard about OLED (Organic LED) monitors that don't require backlighting. They are supposed to be more energy efficient. I know that OLED TVs are available but I haven't seen computer monitors. You may have to wait for this.<br></div></FONT>