The planet is increasingly marked by bald spots, but the level of concern is reaching new heights.
United Airlines remains miles ahead of the competition in its commitments.
It's happening quickly, but the tipping point remains on the horizon.
Other U.S. cities aren't quite ready to put the brakes on expansion by ride-sharing services, but they're demanding more data on their impact on traffic congestion and public transit ridership.
A new research initiative in New York could help make the cost dynamics for corporate buyers more attractive.
These kinds of efforts aim to prevent future food production from going to a "dark place".
And they want more clarity on fossil fuels phaseouts.