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A House Committee begins debate on articles of impeachment; Washington state is set to launch a paid family, medical leave program; advocates for refugees say disinformation clouds their case; and a new barrier to abortion in Kentucky.

2020Talks - December 12, 2019 


Today’s the deadline to qualify for this month’s debate, and entrepreneur Andrew Yang made it - the only non-white candidate who’ll be on stage. Plus, former Secretary Julián Castro questions the order of primary contests.

Research: Greenhouse Gases Could Devastate Christmas Trees of Future

Researchers at the University of Delaware say greenhouse gases could kill most of the trees in the pine forests of Southwest by the end of the century. (kconnors/morguefile)
Researchers at the University of Delaware say greenhouse gases could kill most of the trees in the pine forests of Southwest by the end of the century. (kconnors/morguefile)
December 22, 2015

PHOENIX - A new report has bad news for Christmas trees, contending that many of the trees that make up the forests of Arizona and the West could die by the end of this century from the effects of increased carbon in the atmosphere.

The grim prediction comes from the University of Delaware, where research revealed that evergreens such as pinion and ponderosa pines and junipers could be wiped out by drought and high temperatures caused by greenhouse gases.

Geography professor and report co-author Sara Rauscher said the conclusions are supported by overwhelming evidence.

"All of this information converged into sort of projections by the end of the century that needle-leaf evergreen forests in the Southwest may experience mortality," she said, "so they may all die by the end of the century."

Rauscher said they studied millions of acres of forests in the region extending from California to Texas, and north to Colorado and Utah. She said scientists began seeing signs of a tree die-off in the early 2000s and analyzed climate projections to reach their conclusions.

If a mass tree-kill isn't bad enough, she said, having fewer trees could make climate change even worse.

"A lot of carbon is actually what we call sequestering; it's stored in that biomass," she said. "And so, if all of this vegetation dies, all of the carbon that it holds is going to be released into the atmosphere."

She said some of the measures proposed to limit the release of greenhouse gases could delay the process, but perhaps only by a decade or two.

A release about the study is at udel.edu. The full study is at nature.com.

Mark Richardson, Public News Service - AZ