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May 9, 2014
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Scientists have wondered what more carbon dioxide in the atmosphere will mean for food crops, and a new report answering that question has experts worried.

In a new study published in Nature, researchers shared findings from recent experiments on crops conducted around the world. NPR reports that scientists put carbon dioxide jets in open fields, releasing 500 parts per million of C02, the amount estimated to be in the air in 40 to 60 years (currently, carbon dioxide reaches roughly 400 parts per million). Researchers grew rice, wheat, and peas, and discovered that while crops grew faster and had yields increase by 10 percent, there was also a 5-10 percent reduction in nutrients like protein, zinc, and iron.

"If elevated CO2 or other climate change processes are working against us, we're going to have to work even harder to raise those levels," Michael Grusak, a researcher with the USDA's Children's Nutrition Research Center, told NPR. Scientists are not sure why this happens, but believe it could be that as plants produce more food, trace nutrients become diluted.

Zinc and iron deficiencies are already affecting two billion people around the world, with serious consequences: A lack of zinc prevents a child's immune system from working properly, and insufficient iron intake lowers the IQ of children, NPR says. As it is, many of the most popular crops in the world, particularly rice and corn, already don't have much iron or zinc; they are staples mainly because they are inexpensive. An international effort is now underway to create new varieties of crops through plant breeding, shooting for higher levels of these nutrients. --Catherine Garcia

9:25 a.m. ET

After years of delay, Twitter feuds, and technical difficulties, Kanye West has finally bestowed upon us his seventh album, The Life of Pablo. You can stream it through Tidal, buy it from his website, or just watch a couple of his Saturday Night Live performances below. Here's "Highlights":

And this is "Ultralight Beam." Enjoy. Julie Kliegman

8:07 a.m. ET
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In his first full day in Mexico, Pope Francis spoke directly to the issues facing the nation Saturday, the Los Angeles Times reports.

"I beg that you not underestimate the moral and antisocial challenge which the drug trade represents for Mexican society as a whole, as well as for the church," he told church leaders at a Mexico City cathedral.

The pope also delivered a speech to politicians alongside President Enrique Peña Nieto. Francis stressed the need to care about the common good, not just those who are privileged.

"Each time we seek the path of privileges or benefits for a few, to the detriment of the good of all, the life of society becomes a fertile soil for corruption, drug trade, exclusion of different cultures, violence, and also human trafficking, kidnapping, and death, bringing suffering and slowing down development," Francis said. Julie Kliegman

7:39 a.m. ET
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In 2015, 3,545 civilians were killed due to war in Afghanistan, while 7,457 were injured, the United Nations said in a report released Sunday, The Associated Press reports.

That's a 4-percent decrease in deaths, but a 9-percent increase in injuries. The majority of the violence can be attributed to civilians caught in the ongoing crossfire between the Afghan government and the Taliban. Julie Kliegman

February 13, 2016
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Donald Trump is backed into a corner in South Carolina, where he has been routinely booed by the debate audience for everything from insulting Jeb Bush to insinuating 9/11 was George W. Bush's fault. Perhaps as a result, when Ted Cruz turned his criticism on Trump, Trump came back swinging with a particular vengeance.

"You are the single biggest liar, you're probably worse than Jeb Bush," Trump said — a mighty insult in his book. Trump added that Cruz is a "nasty guy."

"This guy lied about Ben Carson…and he just continues," Trump went on.

However, Trump was met with what is becoming a familiar sound this Saturday: Boos. Watch below. Jeva Lange

February 13, 2016
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Marco Rubio and Ted Cruz are the only Cuban-Americans on the South Carolina Republican debate stage, and things got especially heated and personal when Cruz criticized a time Rubio went on Univision to speak in Spanish about his immigration policy.

When Rubio was given the chance to respond, he snapped, "I don't know how [Cruz] knows what I said on Univision because he doesn't speak Spanish."

Cruz countered by shouting in Spanish at Rubio. "We can do this in Spanish, if you want," he roughly said.

Some Spanish speakers took issue with Cruz's reply, however:

Nevertheless, Rubio didn't take Cruz up on the challenge, continuing on in English — but it was a moment for the books. Watch below. Jeva Lange

February 13, 2016

Jeb Bush and Donald Trump locked horns for the second time in the South Carolina Republican debate when Trump took a swing at one of his favorite subjects of ridicule — the Bush family.

"I am sick and tired of him going after my family," Bush began in response, going on to say that, "While Donald Trump was building a reality TV show, my brother was building a security apparatus to keep us safe."

Trump interrupted, pointing out that 9/11 happened while George W. Bush was in office — and was greeted with a round of angry boos.

"He had the gall to go after my mother," Bush went on. "My mom is the strongest person I know."

But Trump, never one to cede the last word, quipped, "She should be running." Jeva Lange

February 13, 2016
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After Jeb Bush explained his policy for going after ISIS at the GOP presidential debate in South Carolina Saturday night, Donald Trump ripped into the former Florida governor — and was met with ferocious boos from the audience. "Jeb is so wrong, Jeb is absolutely so wrong," Trump said of Bush's call to dispose of Syrian President Bashar al-Assad, only to get the audience hissing.

Trump wasn't put off. "You know who that is? That's Jeb's special interest and lobby talking," he said, drawing his second round of boos.

"I only tell the truth, lobbyists," Trump replied. Jeva Lange

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