Cities are focusing on clean air and water, renewable energy, public transport, providing parks and greenbelt land and community involvement.

They say beauty is in the eye of the beholder, but some baby animals aren't conventionally cute.

Certain delicacies, as well as some everyday foods, can be fatal to humans if not properly prepared for consumption.

From geometrical faces carved by forces of nature to sleeping giants in the sea, these 18 strange yet amazing tricks of nature creatively mock man’s design.

Rooftop gardens give a view of nature, improve air quality, provide roof insulation, delay storm water runoff and increase natural habitat spaces for birds.

Photos and videos of powerful volcanic eruptions from around the world.

Rainforest treetop walks are not for the faint of heart or those fearful of heights, but incredibly amazing adventures for those who dare to take the walk.

Spices were one of the main products in early international trade. Many of today's popular pungent plant-based flavors are the same as their equally desirable fore-bearers.

Though sandy, palm-framed beaches dominate the calendar industry and the imaginations of tourists, the world's rocky, rugged coastlines are no less stunning

Tucked away in the Georgetown district of Washington, D.C. is a 16-acre treasure, rich with history and botanical surprises, Dumbarton Oaks gardens.

Rivers are still important transportation routes in places where roads and rails cannot go. They are also a source of energy and drinking water.

Several large summer music festivals are pushing the envelope in terms of environmental and sustainability initiatives.

Desert topography seems especially alien. It is no surprise that some of the world's most unusual and spectacular flowers and trees are found in the desert.

For these animals, negotiating rocky terrain and finding food in such a scarce environment is second nature.

From cougars to crocodiles and alligators to hippopotamuses and rhinos, you would be surprised to see what exotic animals some people own as pets.