We've all seen those gently worded, politically correct suggestions in our hotel rooms - "____ gallons of water are used each day cleaning towels and sheets that have been used just once..." While guests are invited to re-use sheets or towels in the name of environmental friendliness, the conservation serves another purpose -- lowering housekeeping costs.

With occupancy rates on the decline, hotel chains are looking for ways to limit expenses, and one of these ways is by reducing housekeeping efforts. Some Wyhndham Worldwide (WYN) chains, such as Howard Johnson, Ramada, and Super 8, leave linens unchanged whenever possible. WYN's Days Inn chain is soon going to adopt a three-day change rule (I'm assuming all hotels still change between guests, regardless of the length of stay).

On April 26, the long anticipated Senate climate bill is slated for its debut. Climate change talking points aside, how powerful a piece of legislation will this bill turn out to be for investors, and what could be its effects on manufacturing, retail and energy stocks?

For the sake of discussion, let's just assume that the bill will pass and become law. The first thing to understand is that it's not much more than an act of taxation. That new tax will be levied against businesses large and small via carbon offsets. They'll be showing up on balance sheets everywhere. Granted, we all know that businesses hand their tax bills down line to the consumers, but for large corporations and conglomerates, it's certain that the documentation and accounting will be more than a little distracting. Of course some business giants will be able to simply buy their way out from under the mess.

Instigated by an agreement negotiated between the European Commission (EC) and Microsoft Corp. (MSFT), a new browser selection utility has just become available. Although the browser choice software is intended mainly to be distributed through the Windows update system familiar to Microsoft's Internet Explorer (IE) users, it is also available online for anyone to access.

It is reported that Microsoft IE currently holds approximately 62% of browser market share. That is a powerful position for the company to be in when considering that web browsers are absolutely essential pieces of software. That is, in part, why the EC put pressure on Microsoft to open up the playing field to lesser known browser utilities. With their demands, European regulators essentially cut Microsoft's exclusive IE umbilical cord in July of 2009.

A recent study from the London School of Economics produced some findings that could be seen as a blow to proponents of aggressive investment in emerging green technologies: investments in contraception are five times more effective in reducing carbon emissions than green energy technologies like wind and solar power.

The symbol of the green movement shouldn't be a wind turbine. It should be a condom.

How do you know the green finance sector has arrived? Well, it got its first Ponzi scheme! Allegedly.

The SEC filed charges against four people and two companies in a Denver federal court on Monday. Mantria Corp. and its principals, Troy Wragg and Amanada Knorr, stand accused of running raising $122 million from more than 300 investors in what could be a dozen fraudulent offers of securities. Mantria engaged Speed of Wealth LLC, run by Wayde and Donna McKelvy, to dump the cash out of their retirement plans and tap their home equity to "invest" in Mantria, which they said was offering returns ranging from 17% to "hundreds of percent" every year.

Investors hoping to ride the climate change bandwagon have had a roller coaster ride over the past two years. Greentech stocks soared with the oil spike in 2007 and 2008, then crashed with stock market and commodity price declines in 2009. Since then, some of the most obvious stock plays have strongly rebounded. Many solar stocks have posted high double-digit gains since rebounding off year-to-date lows in March 2009.

The leading solar panel manufacturer, FirstSolar (NASDAQ: FSLR) has appreciated by 45% from lows of near $100 to a closing price of $154 on October 14. "I wouldn't be stepping into buying these stocks right now," says Pacific Crest senior analyst Mark Bachman, who covers solar stocks. Still, he rates FirstSolar as a market perform and considers it the best solar stock at present on his coverage list.

Across the country, college classes are starting. In each of these classrooms, students are struggling with calculus, trudging through Candide, and wondering just what the hell they're going to do with their degrees upon graduation. The last of these is characteristic of every college student, especially those of us, with the foresight fortitude recklessness zeal to major in liberal arts fields (in my case, Philosophy).

The anxiety is a bit higher this year, given a high rate of unemployment, the likelihood of a "jobless recovery" and the fact that it could take years for destroyed value to be recovered.

We're still in the early stages of this trend, but it's pretty clear that the green energy sector is fast becoming a venture capital darling. Today, for example, five deals were announced in one publication alone (three VC, two acquisitions). The three investments account for $47.4 million in VC investment. And only yesterday, Solazyme picked up another $57 million in its Series C round.

In what remains a capital-constrained market, the cash is still flowing. In the private equity space, investments in clean technologies have remained steady from 2007 to 2008, despite broader economic calamity. Such commitment this early in the game may hint at what the next bubble will be.

It was going so great for a while. Investors were eagerly pouring cash into renewable energy stocks as solar and wind energy seemed the perfect answer to the looming energy crisis. The more the news became grim and gas prices went up, the more investors fled to companies like First Solar (NASDAQ: FSLR), driving the stock to over $300 a share in the spring and summer of 2008. Today, the stock closed at $115.75 and has hovered in the low 100s for past few weeks.

This climate has changed, all right: it's changed to "fear." No longer are investors content to contribute to long research & development cycles for unproven business models; nor are they satisfied that credit will be available to finance the major capital expenses which accompany wind and solar energy systems. The world may be sinking ever faster into an energy crisis, but it's the financial one that matters far more to opportunistic investors -- and with a recent drop in demand, industry watchers are concerned prices may not hold up to mid-2008 expectations. According to green fund manager Chris Walsh, quoted in a Reuters article, "There are too many players out there, and there are too many smaller players."

In my opinion, while the best-performing alternative energy stocks were certainly pricey in early summer, the downturn they've taken is shortsighted. The recent plunge in oil prices (and let's remember it's a plunge only compared to the newly-set benchmark of 2008) won't last for more than a few years, at most, if worldwide oil production models are correct; and then alternative energy sources will gain renewed interest from investors; making it a likely long-term bet.

A world without ice cream is unthinkable. But serving up frozen food in the U.S. in the middle of the summer (when we scream most loudly for ice cream) is creating greenhouse gases due to the hydroflourocarbons used in most refrigerators and freezers. Something must be done.

Enter Ben & Jerry's, whose parent, Unilever (NYSE: UL) has been working with Greenpeace, McDonald's (NYSE: MCD) and Pepsico, Inc. (NYSE: PEP) to develop more global-warming-friendly (or unfriendly?) freezers. The company will be rolling out the country's first HFC-free freezer in convenience stores and supermarkets across the U.S.; and as a bonus to your favorite ice cream outpost, the green freezers use about 10% less energy than their HFC-emitting cousins.

The new freezers use butane rather than HFC as a refrigerant and required special permission from the EPA; which has banned the use of butane and propane (which are used throughout Europe and Central and South America for refrigerators and freezers) because these hydrocarbons are flammable and are blamed for depleting the ozone layer. The 2,000 freestanding Ben & Jerry's freezers are just a test, and it may be eight to 10 years before the company is allowed to replace all of its 100,000 freezers nationwide.

While it will likely be an extremely moderate impact on expense reduction, the rollout of green freezers stands to underscore Ben & Jerry's ethical, do-gooder image in the mind of its consumers and give it yet another edge over rival Haagen-Dazs.

Minyanville's Sean Udall dares to share the kind of keen insight and actionable information you won't find in any prospectus. Here he answers a reader's burning question about "green" stocks. For more original thought, visit www.minyanville.com.

Professor Udall,

Do you have any opinions on Zoltek Companies, Inc. (NASDAQ: ZOLT)? My wife wants me to buy everything "green". Her last "green" company idea was General Electric (NYSE: GE). I know, right? I bought a little just to quiet the noise level. I'm into a little SunPower (NASDAQ: SPWR) and Evergreen Solar (NASDAQ: ESLR). Does Zoltek have legs?

Thanks,

Minyan L.

Minyan L.,

First, that's hysterical. Second, a word of caution: Going all green, or all of any one thing, is something I'd never advocate. If you do, you do so at your own risk, as nothing in the market is ever as obvious as it seems, especially when it seems totally obvious.

If the nation's oil companies are having trouble getting more crude out of existing fields, perhaps the solution is to put rigs in Yellowstone National Park.

"Green" environmentalists may be in for bad days. According to The Wall Street Journal, "Increasing U.S. oil production would require overturning decades-old moratoriums that limit offshore drilling and accelerating leasing of federal lands." It may come down to whether eagles and black bears mind oil exploration in the regions where they live.

Forest animals may not care, and that could be the crux of the argument. Although oil spills are not unheard of, they have become exceedingly rare. Bringing out oil from protected land may have very little environmental risk.

In some ways, opening restricted land may be the only way to save lower class and some middle class Americans from gas and oil prices so high that their spending ability is being crushed.

What black bear would want to see that happen?

Douglas A. McIntyre is an editor at 247wallst.com.

Whole Foods Market (NASDAQ: WFMI) is banning plastic bags from its 270 locations. The switch to a choice between reusable bags and paper will take effect on Earth Day, April 22.

It's certainly a bold move and demonstrates a lot of concern for the environment. It will also spruce up Whole Foods' image as an environmentally-conscious retailer and generate a ton of free publicity for the company, starting with the New York Times story.

Whole Foods has served as a trend-setter for the larger grocery chains, and this move could inspire stores like Kroger (NYSE: KR) and Safeway (NYSE: SWY) to make similar switches, depending on how it works out.

During its trial runs, Whole Foods found that eliminating plastic only led to a 10% increase in paper bag use, demonstrating that consumers tend to switch to the reusable bags.

That's good for the environment, and it also cuts costs: Even Wal-Mart (NYSE: WMT) has taken notice by phasing in reusable bags as a third option. The plastic bag seems destined for obsolescence.

The 21st century may be the end of the "Plastics, young man!" era.

Google (NASDAQ: GOOG) is a leader when it comes to being a "green" kind of company. It shuttles employees from the Bay Area to its Mountain View headquarters in biodiesel vans, has what is considered the be the largest solar array in corporate America and uses alternative energy in its operations, unlike most of the business world.

But what about all the actual electricity the company consumes? It has huge data centers all over the world that power its search and web product network, and these campuses consume gobs of electricity off the global grid. So, does Google purchase electricity for these data centers from electric cooperatives that generate all that juice with standard coal-fired electricity generation plants? Hard to tell, because the company won't say.

Wal-Mart (NYSE: WMT) has been making headlines for months with its environmental initiatives, and now Target (NYSE: TGT) is in the news. The retailer announced that it will be reducing the use of PVC in packaging and children's products.

The EPA classifies PVC as a human carcinogen. Target has been the subject of protests from environmental groups pressuring the company to reduce its use of PVC and be more environmentally conscious. Of course, Target says its plans to reduce its use of the product predate the protests.

Target's corporate website has a page devoted to its environmental initiatives. A few of the highlights:

• "Energy-efficient fluorescent lamps are used throughout our stores, a first in the retail industry. We are currently changing our sales floor lighting from a three-lamp to a two-lamp fixture, which will reduce our energy consumption by 22 percent."
• "Four stores in California draw 20 percent of their annual electricity needs from their own rooftop solar-panel systems. In 2007, Target will retrofit 14 more California stores to operate on solar power."
• In 2006, the company "reused 385 million garment hangers and recycled 2.1 million pounds of plastic and 153,000 pounds of metal from broken hangers."

Wal-Mart and Target appear to be locked in a battle to one-up each other on environmental responsibility, and that's great news for the planet.