Graphic designer Jack Hagley's new infographic shows the world's population as 100 people.

Says the United Nations Department of Economic and Social Affairs.

Concerned about the overpopulation of our planet and the effect it has on wildlife? Perhaps it's time to talk about the most effective form of male contraception.

If the latest projections prove to be accurate, we need to plan for about a 10% increase in the needed supply of food, drinking water, and energy, and in carbon dioxide emissions by 2050.

It could also help us eradicate heritable diseases in dogs.

A satellite that ran out of fuel two years ago is now giving scientists a huge wealth of data.

3D maps created by Climate Central show how sea level rise could change some familiar cityscapes.

The overhaul now includes the Voyager feature for deep exploration, not just satellite views.

A study from Stanford University reveals the interconnectedness of politics and the environment.

Finally one state is putting a stop to the "exfoliocean." Hopefully others will follow its lead, forcing companies to adopt eco-friendly alternatives.

A posse of paper penguins has spread to major international cities in the past week, as part of a new Greenpeace campaign to protect Antarctica.

Laura Laker of the Guardian describes growing complaints in Germany and the UK.

From oldest to tallest to most sacred and more, we present a brief who's-who of arboreal heros.

These skyscraping superstars are the stalwart examples of their species.

WIth the death of Sudan, the world's last male northern white rhinoceros, the species is one step closer to complete extinction.

One of the '25 most wanted' lost species, the silver-backed chevrotain is a snaggle-toothed, deer-like species that is the size of a rabbit and walk on its tippy toes.

Lessons from the kitchens at Le Corbusier's Unité d’Habitation in Marseille.

Instead of using a conventional polyurethane core, this sustainable surfboard starts with an algae-based foam blank.

Humans dump millions of tons of phosphorus into lakes every year, and it's destroying their ecosystems.

It's the usual fight between the contractor who wants to be paid for cost overruns and the developer who claims it's all a fixed price contract.

The Brooklyn Journalist covered this project like a blanket, and looks at some of the detailed claims.

Examples of government looking out for the public good by rational regulation are resurfacing.

The makers of the EcoDataCenter prefer the term "climate-positive."

By 2030, Britain hopes to demonstrate that even cement, steel and glass industries can operate at net zero emissions.

People are finally beginning to take this issue seriously.

Letting kids venture out alone could be the best thing you do for them.

Since the Rena, a Liberian ship, ran aground on a reef off the coast of New Zealand 10 days ago, an environmental catastrophe has been brewing. Oil is spilling into the ocean, harming wildlife and reaching shore.

There are 17 atriums that need to be filled with creative uses.

Steve Webb thinks we should tax upfront carbon like cigarettes, and we should build in wood and stone.

A young Ecuador slender-legged tree frog considers a fern.

When everything seems to be falling apart in the world, the most useful thing you can do is focus on your own community and making it a better place.

Anthony Thistleton makes a persuasive case in a new book, 100 Projects UK CLT.

These 131 exercises will teach you to block distractions and deepen your focus.

Author Cal Newport argues that it's time to make hard decisions about our digital lives and embrace a 'philosophy of technology use.'

This book explains how "one of the most valuable skills in our economy is becoming increasingly rare."

A new report ranks countries by their green investments, and also compares performance to our perceptions.

"Can we afford to take action?" just became "Can we afford not to?"

Thanks to the internet, housesitters can now travel the world, living in different places for a few days or a few months for free, in exchange for taking care of an absent homeowner's property, pets or errands.

And it's not just lefty TreeHuggers who are outraged; Everybody is in on this war of words

Scientists say levels are dangerously high, affecting wildlife and ecosystems.

A new decree has opened the door to global waste exports – and rampant pollution.

I wrote last year about the Boulder-based Unreasonable Institute's search for people who have great ideas, who think big, who want to change the world, and who seem like they can. Last year's fellowship was a great

Despite Natura's seemingly excellent and forward-thinking business model, their list of ingredients is surprisingly awful and toxic, which calls into question the B Corp certification standards.

In honor of World Wetlands Day, we’re turning our gaze towards the Pantanal, the world’s largest wetlands—and one that’s seriously threatened.

It's a mix of speculative fiction and informed prediction. Which do you think is most plausible?

The Story of Stuff's latest film underscores the importance of putting deposits on all cans and bottles.

The tech pioneer turned investor talks meat, batteries, and cement.

But nobody is buying greener cement because it costs more.

Power the World has already brought solar lights to Haiti, now it's working to bring solar powered healthcare kits to Uganda + get a million signatures so that policymakers know we care about ending energy poverty.

It is as counterintuitive as it is true: Around the world, communities who have resided on the land the longest often have the most tenuous rights to that land.