Scientists are increasingly concerned that climate tipping points might "cascade" into multiple heating effects that does irrevocable damage to the planet.

"New research warns that the earth may be approaching key tipping points, including the runaway loss of ice sheets, that could fundamentally disrupt the global climate system. A growing concern is a change in ocean circulation, which could alter climate patterns in a profound way," according to an article by Fred Pearce.
A recent study, published in Nature, suggests that changes to ocean circulation could produce a cascade of effects, each triggering another, "creating an irreversible shift to a hotter world," according to Pearce's explanation.
Pearce is compelled by that recent research, but there's a history of similar findings to share. Here's how Pearce summarizes the three tipping points that worry researchers:
The potential tipping points come in three forms: runaway loss of ice sheets that accelerate sea level rise; forests and other natural carbon stores such as permafrost releasing those stores into the atmosphere as carbon dioxide (CO2), accelerating warming; and the disabling of the ocean circulation system.
While researchers used to think of each of these tipping points as independent of each other, warning such as this new research suggest the cascade relationship between each.
FULL STORY: As Climate Change Worsens, A Cascade of Tipping Points Looms

Americans May Be Stuck — But Why?
Americans are moving a lot less than they once did, and that is a problem. While Yoni Applebaum, in his highly-publicized article Stuck, gets the reasons badly wrong, it's still important to ask: why are we moving so much less than before?

Using Old Oil and Gas Wells for Green Energy Storage
Penn State researchers have found that repurposing abandoned oil and gas wells for geothermal-assisted compressed-air energy storage can boost efficiency, reduce environmental risks, and support clean energy and job transitions.

Placekeeping: Setting a New Precedent for City Planners
How a preservation-based approach to redevelopment and urban design can prevent displacement and honor legacy communities.

Study: Maui’s Plan to Convert Vacation Rentals to Long-Term Housing Could Cause Nearly $1 Billion Economic Loss
The plan would reduce visitor accommodation by 25,% resulting in 1,900 jobs lost.

Idaho Data: Unexpected Vehicle Repairs Exacerbate Housing Instability, Eviction Risk
Over 21 percent of clients struggle with transportation barriers.

A Year-Long Investigation On Permanent Supportive Housing
The New York Times reveals what’s working and what’s not in the cornerstone of Housing First.
Urban Design for Planners 1: Software Tools
This six-course series explores essential urban design concepts using open source software and equips planners with the tools they need to participate fully in the urban design process.
Planning for Universal Design
Learn the tools for implementing Universal Design in planning regulations.
Heyer Gruel & Associates PA
City of Moreno Valley
Institute for Housing and Urban Development Studies (IHS)
City of Grandview
Harvard GSD Executive Education
Salt Lake City
NYU Wagner Graduate School of Public Service
City of Cambridge, Maryland