Global X debuted two exchange-traded funds giving investors exposure to wind and solar energy companies. The Global X Wind Energy ETF is linked to the Solactive Wind Energy Index, while the Global X Solar ETF seeks to replicate the performance of the Solactive Solar Index.

The Summer Olympics in Rio de Janeiro is underway, and all major sports venue construction was completed on time, according to a public relations group. This article includes time-lapse satellite photos showing the construction of six key venues.

More than 1 million images make up a time-lapse video of the construction of the $4 billion World Trade Center Transportation Hub, or the Oculus, in New York City. "Unique and impressive designs like the Oculus are defining 21st-century architecture, and my hope is this movie acts as a time capsule of our innovative culture," said Brian Cury, founder of EarthCam and producer of the video.

On the 13th anniversary of the Sept. 11, 2001, terrorist attacks, Earthcam has released a time-lapse video of the construction of 1 World Trade Center as a tribute to those who perished that day. The highlight of the memorial at 1 WTC will be the "Tribute in Light," two beams that represent the two towers destroyed in the attacks. Meanwhile, the "Remember and Rebuild" exhibit at a museum in Michigan focuses on the theme that "everyday people were the heroes of 9/11," says photographer Amy Dreher. "They helped clear the space. They helped us rebuild. Construction workers, sanitation workers, firefighters and police officers came together from across the country and helped."

A time-lapse video lets viewers see the progress of New York City's One World Trade Center over the last nine years, including the addition of the 408-foot-tall, 758-ton silver spire. The 1,776 foot-high tower, which is slated to be the tallest in Western Hemisphere, is scheduled to be completed next year.