I’m now writing a weekly column called Sustainability for FORTUNE.com and CNNMoney.com. The FORTUNE website now maintains an archive of my columns, so I no longer list them here. You can subscribe to the columns via an RSS feed on the Fortune columnists page. If you have an idea for a column, please email me at marc.gunther@gmail.com.

NRG Energy pursues “clean coal”
To critics, “clean coal” is an oxymoron. To NRG Energy CEO David Crane, it’s the future.
August 30, 2007

Sony Champions Free Recycling
The electronics giant says it will take back its products at no cost.
August 22, 2007

Rupert Murdoch’s climate crusade
Free lights bulbs, subsidized hybrids and babes in green from News Corp.
August 15, 2007

Chlorine plants send mercury rising
Oceana targets chlorine makers
August 9, 2007

SuperTrees
A South Caroline biotech firm genetically modifies trees
July 31, 2007

GE unveils new green card
But spending money to save the planet doesn’t make sense.
July 25, 2007

Trans-forming Corporate America
From GM to Google, companies protect transgendered people from discrimination
July 23, 2007

The Amazing Freecycle Story
One man’s trash is another’s treasure
July 13, 2007

Green Business’s Go-To Guys
Why big companies call Green Order
June 28, 2007

A Fight About Fish Farms
The seafood industry wants to grow more fish in the ocean, but others say not so fast.
June 8, 2007

ExxonMobil: Profits and Discontent
On the eve of its annual meeting, critics say the oil giant is arrogant and irresponsible.
May 29, 2007

Green Before Green Was Cool
Shaklee embraced environmental responsibility decades ago
May 18, 2007

Wal-Mart: Here comes the sun
The retail giant’s solar energy deal will boost the solar business
May 7, 2007

Caterpillar Climbs on the Green Bandwagon
May 3, 2007
The industrial giant finds that sustainability plays in Peoria

Bottled Water: No longer cool
April 25, 2007
Activists turn up the heat on Coca-Cola, Pepsico and Nestle

Warren Buffett and Darfur
April 18, 2007
The Sudan divestment movement targets Berkshire Hathaway’s China holdings.

A Texas Oilman Tackles Climate Change
April 11, 2007
ConocoPhillips supports mandatory greenhouse gas controls

Baseball, technology and immigration
April 5, 2007
America embraces ballplayers, but not foreign-born engineers

Gore needs a greener Apple
April 3, 2007
Environmental groups tell Al Gore to push the computer maker to improve its practices.

Why CEOs Love Rwanda
March 29, 2007
As a small African nation recovers from genocide, Google, Starbucks and Costco lend a hand.

Fixing the Grid
March 22, 2007
Everyone wants electricity but no one wants new power lines in their backyard.

Saving the World-One Plastic Bag at a Time
March 15, 2007
Government, environmentalists and even a few businesses want to put an end to plastic pollution.

Dell Gets on the Environmental Bandwagon
March 8, 2007
Michael Dell and his company will now recycle your computer hardware for free — even if you’re not buying anything new from Dell.

Coal plants get burned
(March 2, 2007)
As concerns mount over global warming, getting new coal plants built is harder than ever.

Not-so-green magazines
(February 22, 2007)
Some glossies cover the environment, but cover up their own practices

Building a better, greener light bulb
(February 14, 2007)
Lighting is a $40 billion industry, and getting the world to switch bulbs is a formidable task.

A Future Without Fish?
(February 6, 2007)
Wal-Mart, Whole Foods and Disney aim to protect the seas. Navigating choppy waters in search of sustainable seafood.

Fidelity’s Sudan Problem
(January 29, 2007)
Divestment campaign targets mutual funds

ExxonMobil’s Climate Change
(January 26, 2007)
The oil giant reaches out to its critics.

Finding God at Work
(January 17, 2007)
Companies become faith-friendly.

Wal Mart Trashes Garbage
(January 11, 2007)
Why the world’s biggest retailer and the city of San Francisco are pushing “zero waste.”

How Green is Wall Street?
(January 3, 2007)
Investment banks say they are eco-friendly, but back coal plants.

Layoffs? Not if we can help it.
(December 27, 2006)
How Cox Enterprises Closed a Plant and Saved 400 Jobs.

Guacamole and Green Tea
(December 20, 2006)
Think that guacamole is mostly avocado? Nuh-uh. Some food labels mislead consumers.

Retailers Clean Up Their Paper Trail
(December 13, 2006)
Catalog giants like Dell, William-Sonoma and Victora’s Secret turn the page, pledging to use more recycled paper.

Bringing Gay Media Out of the Closet
(December 6, 2006)
The success of Viacom’s gay-themed cable channel, Logo, testifies to the power of a loyal audience.

Wal-Mart Becomes Gay Friendly
(November 30, 2006)
The retail giant has been walking a thin line between gay rights groups and Christian conservatives. But there’s no backing away from the issue now.

Texas’s Big Global Warming Battle
(November 9, 2006)
Environmental Groups Take on TXU for proposed coal burning plants.

Why It’s Not Easy Being Green
(November 2, 2006)
Natureworks’ bio-plastic runs into opposition from the recycling industry.

Supreme Court Tackles Global Warming
(October 27, 2006)
As the U.S. Supreme Court prepares to take up the issue of climate change, some unusual alliances are forming – and corporate America finds itself on both sides of the debate.

Business in the Blogosphere
(October 18, 2006)
Big companies are blogging, for better (Sun CEO’s geeky but candid blog) or worse (‘Wal-Marting across America’)

Ted Turner’s Montana Adventure
(October 4, 2006)
The cable mogul is raising buffalo, killing fish, saving the planet, making money and having fun. A visit to the Flying D in Bozeman, Montana.

Are Kleenex tissues wiping out forests?
(September 27, 2006)
Kimberly-Clark takes heat from Greenpeace and other environmental groups for misleading the public on its sustainability practices.

Corporate America backs gay rights
(September 20, 2006)
A trickle of corporate support for gay and lesbian workers that began about 15 years ago has turned into a flood.

Chipotle: Can fast food be ‘good’ food?
(September 13, 2006)
Chipotle is growing by leaps and bounds, offering what its CEO calls ‘food with integrity.’

‘Small-Marts’ take on Wal-Mart
(August 30, 2006)
Small, local groups nationwide are fighting back against big business and helter-skelter globalization.

Organic for everyone, the Wal-Mart way
(July 26, 2006)
America’s biggest company is also the world’s biggest purchaser of organic cotton.

Corporate America’s hidden risks
(June 28, 2006)
Major headaches threaten companies that ignore their ‘moral liability.’

Cingular Bucks Anti-Union Trend
(July 7, 2006)
The nation’s largest wireless carrier takes the cooperative approach working out a ‘neutrality agreement’ with the CWA.

Does your company keep political secrets?
(May 31, 2006)
FORTUNE 500 companies are becoming more open about executive pay, product safety and environmental impact. But many still resist pressure to disclose campaign donations.

Yoga…Soy..McDonald’s?
(May 17, 2006)
The fast food giant is doing its part to get Americans eating better – but in the end, it’s all up to the customers.

Does ExxonMobil have a problem with gay people?
(May 11, 2006)
The world’s largest oil company is under fire for refusing to specifically prohibit discrimination against gays in its employment policy.

How companies fight sweatshops
(May 3, 2006)
Global brands are stepping in to monitor working conditions at factories –but producing real change isn’t easy.

Yahoo’s China problem
(February 22, 2006)
There’s no easy way for the search giant to fix the damage from its Chinese business. But it has missed an opportunity to mitigate it.