President Barack Obama challenged world leaders to join the United States in fighting global warming. Watch the entire 10-minute speech here.

Actor/activist excited to use new role to share that 'human well-being is intertwined fundamentally with biodiversity'.

The United Nations General Assembly has officially recognized access to safe, clean drinking water as a basic human right.

Is Denver's B-Cycle program nothing but a form of U.N. control of the city? The Mayoral Republican gubernatorial frontrunner thinks so.

Earth has never hosted 7 billion people all at once before, but according to the U.N., it may reach that spooky milestone by the end of this month.

Forty years after the first World Environment Day, and 20 years after the original 'Earth Summit,' Brazil is still a flashpoint for environmental politics.

More than 100 world leaders and tens of thousands of protesters will descend on Rio de Janeiro next week for the Rio+20 summit in hopes of overcoming years of d

Here's a small birthday tribute to Mohandas Karamchand Gandhi, the "great-souled" man who was born 148 years ago today. It's a poignant way to celebrate the man

Health experts argue that banning the preservative could make it difficult for children in developing countries to get life-saving vaccines.

Mongolia, the host of this year's World Environment Day, is home to Earth's rarest bear. Conservationists hope 2013 will mark the start of its comeback.

Here is a sneak preview of what to expect when the AR5 report is issued next week, based on the leaks so far.

The IPCC report is expected to include summaries on melting glaciers, sea level rise and the impact of human activities on the global climate.

UNESCO protects more than landmarks and culturally-significant sites. There are intangible parts of culture that are important, too.

A consumer advocacy group wants to make nutrition labels less confusing.

Consumers who need guidance about all the seals and certifications on food packaging can find some answers in this food label guide.

Part II: Consumers who need guidance deciphering all the seals, certifications and claims on food packaging can find answers in MNN's Food Label Guide.

The banana is perhaps the oldest recorded fruit in the world as well as the most consumed. But some dieters avoid bananas like a slippery peel. Are bananas unhe

If you're wondering if you should be eating more plant-based sources of protein such as tofu, here's the good and the bad about the nutrition.

Strawberry nutrition facts. You probably know these berries pack a vitamin C wallop, but there's a wealth of other good stuff inside including fiber, manganese,

Many common sleep problems can be remedied by small, but specific, changes to nutrition.

Health ratings on packages could influence consumers' purchasing decisions and drive food companies to make healthier products.

Understanding what you are eating is a crucial step to healthier living. But what do all those food labels really mean?

“Eat Pretty” has simple nutrition information to transform your beauty routine – inside and out.

This powerhouse veggie includes compounds that will enable you to run further — but incorporating it into your diet should be done carefully.

Bone broth is nothing new, but it’s suddenly very popular to have a daily mug's worth. Here’s why.

The Institute of Medicine has raised the amount of potatoes, corn and peas it recommends you eat each week.

Clever website factors in diet goals, body type and food preferences to create a weekly meal plan that makes sense.

If we could see a photo of the amount of sugar that's in a soft drink right on the label, would it make us think twice?

Researchers add color-coded traffic symbols along with calorie counts to a menu to see how they influence people's choices.

How healthy are all those cranberries you’ll be eating during the holiday season? You’ll like the answer.

How healthy is that egg? Lots of factors are involved, but the color of the egg shell isn't one of them.

If you're trying to stave off the mid-morning munchies, these foods will satisfy both your taste buds and your appetite.

Did Nutella, the tasty chocolate hazelnut spread, really need more sugar?

Starbucks will be selling its Christmas Tree Frappuccino only until Dec. 11.

Fiber is essential to a healthy digestive system. Find a place for these high fiber foods throughout your day and you'll get plenty.

If you want to get the most nutrients out of your veggies, don't worry about gaining polyphenols or losing nutrients. Just eat them.

You can get all the brain-boosting benefits from these nootropic foods instead of taking supplements, which aren't regulated.

Colorful diagrams help us understand how much of which foods we should be eating.

Sue Flood's new book on emperor penguins, 'Emperor: The Perfect Penguin,' is the culmination of 9 years of work.

Astrophotographer Andrew McCarthy spent hours creating this breathtakingly detailed composite image of our moon.

This year's open category winners of the Sony World Photography competition range from a Chinese shadow puppet show to a mesmerizing underwater dance.

Michigan woman has a 'photo booth' to get a glimpse of the personalities of birds that visit her yard.

Photographer Will Burrard-Lucas's new book 'Land of Giants' chronicles some of the last days of this towering gentle giant.

Annual Koch Institute exhibition explores the thought-provoking and stunning visuals behind life sciences and biomedical research at MIT.

No one gets more excited about iceberg season than camera-toting Canadian Mark Gray.

It's been 50 years since the Apollo 11 mission and the first step on the moon. Here's a look back in photos.

Science Photographer of the Year contest highlights how photos can open a window to science.

Photographer Frank Liu captured photographs of a polka-dotted zebra in Kenya that ended up published in National Geographic.

Wildlife photographer Michel Rawicki captures polar bears in their private moments.

As polar bears struggle to survive in the fast-changing Arctic, MNN presents a tribute to the animals' legendary power, precocity and perseverance.