The population of North American monarch butterflies has plummeted from 1 billion to 33 million in just two decades.

India's revered Ganges and Yamuna rivers cannot be viewed as living entities, the Supreme Court has ruled.

Imagine sinking into the deepest parts of the Central Pacific Ocean, somewhere between Mexico and Hawaii.

In the grand scheme of pressing issues facing residents of U.S. cities — scarce affordable housing, high health care costs, anxiety about immigration status or racial tension, to name a few — warnings about the long-term consequences of climate change can, understandably, take a back seat.

High-resolution earth imagery has provided ecologists and conservationists with a dynamic new tool that is enabling everything from more accurate counting of wildlife populations to rapid detection of deforestation, illegal mining, and other changes in the landscape.

Never has there been a more critical time for the private sector to partner with others to tackle the critical global challenges facing our cities and communities.

Steadily rising ocean temperatures are forcing fish to abandon their historic territories and move to cooler waters.

Is the post-war ascendance of multinational corporations irreversible?

The landmark Paris Climate Agreement was signed in December 2015 by 195 countries, including the United States.

Crowdfunding platforms created to raise capital for projects, products or startup companies have proved to be a powerful financing mechanism for those unable to find funds from traditional sources, such as banks or venture capitalists.