New studies published this week challenge the 2 degree Celsius global warming threshold and call for an early warning system to monitor climate shifts.
"Ever since the 2009 climate talks in Copenhagen, world leaders have agreed on 2 degrees Celsius (3.6 degrees F) as the maximum acceptable global warming above pre-industrial levels to avert the worst impacts of climate change (today we’re at about 0.8 degrees C)," writes Tim McDonnell. "But a new study, led by climatologist James Hansen of Columbia University, argues that pollution plans aimed at that target would still result in 'disastrous consequences,' from rampant sea-level rise to widespread extinction."
The study, which was co-authored by Columbia economist Jeffrey Sachs and published in the journal PLOS ONE, concludes that "[f]ossil fuel emissions must be kept to [500 billion metric tons] and global warming held to about 1.8 degrees to avert disastrous consequences," notes Tony Barboza in the Los Angeles Times.
Barbosa also looks at a new National Research Council report that raises the spectre of sudden shifts in natural and human systems resulting from changes to the climate. To prepare for such threats, the report "[calls] for an early warning system to anticipate sudden climate shifts."
"'We watch our streets, we watch our banks ... but we do not watch our environment with the same amount of care and zeal,' said James White, a climatologist at the University of Colorado, Boulder and chairman of the committee that wrote the report."
FULL STORY: Scientists: Current international warming target is “disastrous”

Trump Administration Could Effectively End Housing Voucher Program
Federal officials are eyeing major cuts to the Section 8 program that helps millions of low-income households pay rent.

Planetizen Federal Action Tracker
A weekly monitor of how Trump’s orders and actions are impacting planners and planning in America.

Ken Jennings Launches Transit Web Series
The Jeopardy champ wants you to ride public transit.

USGS Water Science Centers Targeted for Closure
If their work is suspended, states could lose a valuable resource for monitoring, understanding, and managing water resources.

Driving Equity and Clean Air: California Invests in Greener School Transportation
California has awarded $500 million to fund 1,000 zero-emission school buses and chargers for educational agencies as part of its effort to reduce pollution, improve student health, and accelerate the transition to clean transportation.

Congress Moves to End Reconnecting Communities and Related Grants
The House Transportation and Infrastructure Committee moved to rescind funding for the Neighborhood Equity and Access program, which funds highway removals, freeway caps, transit projects, pedestrian infrastructure, and more.
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