Or are they just fooling themselves and being selfish?

With a carbon credit card, it doesn't have to be hard.

A British critic calls two green icons, rammed earth and Passivhaus, "architectural trickery at its most cynical."

The ones we have left should be preserved; they don't make them like they used to.

The National Ready Mixed Concrete Association (NRMCA) sends out a press release touting their recent political victory in Washington State, and their new promotional campaign, “Build with Strength.” Hilarity ensues.

They save concrete and look great after all these years.

New research sheds new light on why Roman concrete is so strong and water resistant, but let's not get carried away here.

It's a celebration of a technology that covers longer spans with less concrete and looks good, too. Here are some I have feasted on.

Researchers are looking to fungi to help provide a fix for crumbling infrastructure, with promising results.

But for everyone else it is a big nothingburger.

Twice a year we look at yummy waffle slabs, a really efficient way to do more with less.

Making cement puts out a lot of CO2. Making concrete needs a lot of sand. Both are big problems.

A key industry association is working to keep warming to "well below" two degrees.

Created by Zaha Hadid Architects, this innovative project demonstrates the possibilities of using KnitCrete technology for creating curved concrete shells efficiently.

We do a little destructive testing and have a good breakfast.

We need a new system to determine which nations ought to be forced to cut emissions, not the 20-year old outdated one we've got now.

Access to safe, reliable and affordable sanitary napkins is a big barrier to equal opportunity for many girls in developing countries. This inexpensive and clever set allows girls and women to clean, dry and carry their pads discreetly.

The device made from household objects could replace AA batteries for powering small electronics.

The Level Market wants to make the procurement of humanitarian aid and development products as easy as shopping on Amazon.

Achieving 100% zero waste isn't always feasible, but the path toward zero waste comes with its own rewards.

Companies and manufacturers are creating custom solutions for their difficult-to-recycle waste

Industry coalitions working with municipal recycling can work, but only in two circumstances

In Canada, we’ve collected over 150 million units of waste and engaged two million people to recycle.

“Lightweighting” often shrinks down packaging into items that are unrecyclable, difficult to capture, highly polluted and designed without end-of-life solutions.

Consumers are connected to the things they care about, providing access to ventures that have the potential to make real impacts.

Wastes are made in the kitchen.

Who needs flying cars when you can have flying trains?

If it weren't so subsidized, it would be a lot more expensive, and people might fly a lot less.

What do you do when there's no more carry-on room?

Influenced by realism and mythology, these impressive works impart a sense of wonder about the natural world.

These striking works combine natural materials with artificial processes to create crystallized surfaces reminiscent of coral.

Gorgeous, soft and looking like a living UFO, this enormous work of textile art is brightening up one Paris institution.

Just take them with big photos, nobody will ever know.

The impact of flying on climate change cannot be ignored, as I book my next flight.

We know it's bad, but people still do it, which is why we still need to talk about it.

Greener aviation is about to get a boost.

Flying went from being expensive and elite to being mass-market. Enjoy it while you can.

Sure, it'll only have nine seats. But the low cost carrier expects larger electric planes in service by 2027.

It's expected that by 2037 the number of people flying will double.

A secret deal lets the homebuilders dominate the committees that write the building codes for housing.

I was disappointed to see that Subaru, beloved of TreeHugger types, is on the wrong side of this issue.

It's about time more cities did this.

Instead of flaring off gas, they are burning it to run computers that mine bitcoins. Is this any better?

No matter how hard we may try to tame her, Mother Nature always comes back to claim her turf.

In California, many people are saying that all the wiring should be underground because of fire risk. It won't happen.

If you must shop, do it from a company that's spreading the wealth.

The Canadian city is the latest to rethink disposal culture and insist on something better.

A list of 10 resolutions shows that big changes are coming to the professional food world.

Loop's reusable packaging service is coming to brick-and-mortar stores in U.S., Canada, and France.

According to experts in the failure of oil and gas pipelines, there are a handful of factors that can contribute to a pipeline rupture, like the one in Mayflower, Arkansas. A new report finds all were in play on the Pegasus pipeline.