By SETH BORENSTEIN and JENNIFER AGIESTA, Associated Press

 WASHINGTON (AP) — Few Americans question that smoking causes cancer. But they express bigger doubts as concepts that scientists consider to be truths get further from our own experiences and the present time, an Associated Press-GfK poll found.

 Americans have more skepticism than confidence in global warming, the age of the Earth and evolution and have the most trouble believing a Big Bang created the universe 13.8 billion years ago.

 Rather than quizzing scientific knowledge, the survey asked people to rate their confidence in several statements about science and medicine.

On some, there’s broad acceptance. Just 4 percent doubt that smoking causes cancer, 6 percent question whether mental illness is a medical condition that affects the brain and 8 percent are skeptical there’s a genetic code inside our cells. More — 15 percent — have doubts about the safety and efficacy of childhood vaccines.

About 4 in 10 say they are not too confident or outright disbelieve that the earth is warming, mostly a result of man-made heat-trapping gases, that the Earth is 4.5 billion years old or that life on Earth evolved through a process of natural selection, though most were at least somewhat confident in each of those concepts. But a narrow majority — 51 percent — questions the Big Bang theory.

Those results depress and upset some of America’s top scientists, including several Nobel Prize winners, who vouched for the science in the statements tested, calling them settled scientific facts.

“Science ignorance is pervasive in our society, and these attitudes are reinforced when some of our leaders are openly antagonistic to established facts,” said 2013 Nobel Prize in medicine winner Randy Schekman of the University of California, Berkeley.

The poll highlights “the iron triangle of science, religion and politics,” said Anthony Leiserowitz, director of the Yale Project on Climate Change Communication.

And scientists know they’ve got the shakiest leg in the triangle.

To the public “most often values and beliefs trump science” when they conflict, said Alan Leshner, chief executive of the world’s largest scientific society, the American Association for the Advancement of Science.

Political values were closely tied to views on science in the poll, with Democrats more apt than Republicans to express confidence in evolution, the Big Bang, the age of the Earth and climate change.

Religious values are similarly important.

Confidence in evolution, the Big Bang, the age of the Earth and climate change decline sharply as faith in a supreme being rises, according to the poll. Likewise, those who regularly attend religious services or are evangelical Christians express much greater doubts about scientific concepts they may see as contradictory to their faith.

“When you are putting up facts against faith, facts can’t argue against faith,” said 2012 Nobel Prize winning biochemistry professor Robert Lefkowitz of Duke University. “It makes sense now that science would have made no headway because faith is untestable.”

But evolution, the age of the Earth and the Big Bang are all compatible with God, except to Bible literalists, said Francisco Ayala, a former priest and professor of biology, philosophy and logic at the University of California, Irvine. And Darrel Falk, a biology professor at Point Loma Nazarene University and an evangelical Christian, agreed, adding: “The story of the cosmos and the Big Bang of creation is not inconsistent with the message of Genesis 1, and there is much profound biblical scholarship to demonstrate this.”

Beyond religious belief, views on science may be tied to what we see with our own eyes. The closer an issue is to our bodies and the less complicated, the easier it is for people to believe, said John Staudenmaier, a Jesuit priest and historian of technology at the University of Detroit Mercy.

Marsha Brooks, a 59-year-old nanny who lives in Washington, D.C., said she’s certain smoking causes cancer because she saw her mother, aunts and uncles, all smokers, die of cancer. But when it comes to the universe beginning with a Big Bang or the Earth being about 4.5 billion years old, she has doubts. She explained: “It could be a lack of knowledge. It seems so far” away.

Jorge Delarosa, a 39-year-old architect from Bridgewater, N.J., pointed to a warm 2012 without a winter and said, “I feel the change. There must be a reason.” But when it came to Earth’s beginnings 4.5 billion years ago, he has doubts simply because “I wasn’t there.”

Experience and faith aren’t the only things affecting people’s views on science. Duke University’s Lefkowitz sees “the force of concerted campaigns to discredit scientific fact” as a more striking factor, citing significant interest groups — political, business and religious — campaigning against scientific truths on vaccines, climate change and evolution.

Yale’s Leiserowitz agreed but noted sometimes science wins out even against well-financed and loud opposition, as with smoking.

Widespread belief that smoking causes cancer “has come about because of very public, very focused public health campaigns,” AAAS’s Leshner said. A former acting director of the National Institute of Mental Health, Leshner said he was encouraged by the public’s acceptance that mental illness is a brain disease, something few believed 25 years ago, before just such a campaign.

That gives Leiserowitz hope for a greater public acceptance of climate change, but he fears it may be too late to do anything about it.

The AP-GfK Poll was conducted March 20-24, 2014, using KnowledgePanel, GfK’s probability-based online panel designed to be representative of the U.S. population. It involved online interviews with 1,012 adults and has a margin of sampling error of plus or minus 3.4 percentage points for all respondents.

Respondents were first selected randomly using phone or mail survey methods and were later interviewed online. People selected for KnowledgePanel who didn’t otherwise have access to the Internet were provided with the ability to access the Internet at no cost to them.

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On Twitter, follow AP Science Writer Seth Borenstein at http://twitter.com/borenbears and AP Director of Polling Jennifer Agiesta at http://www.twitter.com/JennAgiesta .

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Online:

AP-GfK Poll: http://www.ap-gfkpoll.com

AP-GfK Poll: Sharp divisions after high court backs gay marriage

NEW YORK (AP) — The Supreme Court’s ruling last month legalizing same-sex marriage nationwide has left Americans sharply divided, according to an Associated Press-GfK poll that suggests support for gay unions may be down slightly from earlier this year.

The poll also found a near-even split over whether local officials with religious objections should be required to issue marriage licenses to same-sex couples, with 47 percent saying that should be the case and 49 percent say they should be exempt.

Overall, if there’s a conflict, a majority of those questioned think religious liberties should win out over gay rights, according to the poll. While 39 percent said it’s more important for the government to protect gay rights, 56 percent said protection of religious liberties should take precedence.

The poll was conducted July 9 to July 13, less than three weeks after the Supreme Court ruled states cannot ban same-sex marriage.

According to the poll, 42 percent support same-sex marriage and 40 percent oppose it. The percentage saying they favor legal same-sex marriage in their state was down slightly from the 48 percent who said so in an April poll. In January, 44 percent were in favor.

Asked specifically about the Supreme Court ruling, 39 percent said they approve and 41 percent said they disapprove.

“What the Supreme Court did is jeopardize our religious freedoms,” said Michael Boehm, 61, an industrial controls engineer from the Detroit area who describes himself as a conservative-leaning independent.

“You’re going to see a conflict between civil law and people who want to live their lives according to their faiths,” Boehm said.

Boehm was among 59 percent of the poll respondents who said wedding-related businesses with religious objections should be allowed to refuse service to gay and lesbian couples. That compares with 52 percent in April.

Also, 46 percent said businesses more generally should be allowed to refuse service to same-sex couples, while 51 percent said that should not be allowed.

Claudette Girouard, 69, a retiree from Chesterfield Township, Michigan, said she is a moderate independent voter who has gradually become supportive of letting same-sex couples marry.

“I don’t see what the big hoopla is,” she said. “If they’re happy, why not?”

Girouard said local officials should be required to perform same-sex marriages, but does not think that wedding-related businesses should be forced to serve same-sex couples.

“If the official doesn’t like what he’s being asked to do, then quit,” she said. “But businesses are kind of independent, so if they have a strong belief against it, there are enough other businesses out there for someone to use.”

The poll found pronounced differences in viewpoints depending on political affiliation.

For example, 65 percent of Democrats, but only 22 percent of Republicans favored allowing same-sex couples to legally marry in their state. And 72 percent of Republicans but just 31 percent of Democrats said local officials with religious objections should be exempt from issuing marriage licenses.

By a 64-32 margin, most Democrats said it’s more important to protect gay rights than religious liberties when the two are in conflict. Republicans said the opposite, by 82-17.

Clarence Wells, 60, a conservative from Rockwood, Tennessee, said he strongly disapproved of the Supreme Court’s ruling. He anticipates friction as gay couples try to exercise their newfound rights and people with religious objections to same-sex marriage balk at accepting them.

“I don’t believe it’s going to go over smoothly,” said Wells. “I think a lot of them will be shunned in church. … I think there will businesses that are going to close, because some people are stubborn enough to not want to deal with it.”

Andrew Chan, 41, a moderate independent from Seattle, said he has tried to remain neutral on same-sex marriage.

“For me, it’s always been about tolerating,” said Chan, who works for a nonprofit organization. “I’ve got friends on both sides.”

Chan said he was happy for gays and lesbians who have found someone they want to marry, and he expressed some wariness toward politicians who might try to roll back the Supreme Court ruling.

“That just creates more division,” he said. “Are we looking to move the country forward or move it backward?”

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The AP-GfK Poll of 1,004 adults was conducted online July 9 to July 13, using a sample drawn from GfK’s probability-based KnowledgePanel, which is designed to be representative of the U.S. population. The margin of sampling error for all respondents is plus or minus 3.4 percentage points. Some questions were ask of half samples of respondents and have smaller margins of error. Respondents were first selected randomly using phone or mail survey methods, and later interviewed online. People selected for KnowledgePanel who didn’t otherwise have access to the Internet were provided access at no cost to them.

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Swanson reported from Washington.

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Reach David Crary on Twitter at http://twitter.com/CraryAP and Emily Swanson at http://twitter.com/EL_Swan

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Online:

AP-GfK Poll: http://www.ap-gfkpoll.com


AP-GfK Poll: Minorities, young Americans still backing Obama

WASHINGTON (AP) — Even as the public remains closely divided about his presidency, Barack Obama is holding on to his support from the so-called “Obama coalition” of minorities, liberals and young Americans, an Associated Press-GfK poll shows, creating an incentive for the next Democratic presidential nominee to stick with him and his policies.

Hillary Rodham Clinton, by comparison, is viewed somewhat less favorably by the key voting groups whose record-setting turnout in 2008 propelled Obama to the White House and will be crucial to her own success.

Roughly two-thirds of Hispanics view Obama favorably, compared to just over half of Hispanics who say the same about Clinton. Among self-identified liberals, Obama’s favorability stands at 87 percent, to Clinton’s 72 percent. Half of Americans under the age of 30 view Obama favorably, compared to just 38 percent for his former secretary of state.

The findings offer a window into the factors at play as Clinton decides how closely to embrace Obama, his record and his policies in her campaign for president. Although associating herself with Obama could turn off some independent and Republican-leaning voters, electoral math and changing demographics make it critical for Democrats to turn out high numbers of Hispanics, African Americans and young voters.

Overall, Obama’s job approval rating stands at 43 percent, a leveling off following an AP-GfK poll conducted in early February that put his approval at 47 percent — slightly higher than it had been through most of 2014. The number of Americans who disapprove of Obama’s job performance has stayed relatively steady at 55 percent.

“He just seems to have something in his mind that he wants to accomplish and keeps trying to get it done,” said Christine Klauder, a self-described liberal from southern New Jersey. Klauder said she voted for Obama in 2008 and 2012 and that her support hasn’t dropped off. “He’s more oriented toward the kind of people that I feel that we are, have been all my life.”

Contrast that with Klauder’s views about Clinton, who has yet to win her enthusiastic support. “Being a woman, I think it would be wonderful to see her in — but I’m not sure,” Klauder said. “I think maybe her time has passed.”

Obama, whose troubles in the polls were seen as a drag on Democratic in last year’s midterm elections, has also managed to hold on to recent gains he’s made among core supporters.

When AP-GfK polled in October 2014, Obama’s approval rating among Hispanics had plummeted to 39 percent, as Hispanic advocacy groups demanded that Obama take aggressive action on immigration. One month later, he did just that — and his job approval among Hispanics now stands at 56 percent. Whereas 72 percent of liberals approved of Obama’s performance in October, that number now appears to have climbed, to 82 percent.

The survey reinforces a concern expressed by many Democrats about Clinton’s candidacy: that she just doesn’t inspire the levels of enthusiasm among traditional Democratic constituencies that were so critical to Obama’s success.

In the first weeks of her campaign, Clinton has promoted a number of populist ideas surrounding immigration, voting rights and economics that hew closely to themes that Obama has made central to his presidency. Although she distanced herself from Obama by suggesting she would have voted against giving him expedited authority to negotiate trade deals, she offered explicit support for the controversial nuclear deal with Iran that Obama announced this week.

Esther Danner, a 61-year-old from Hanover, Maryland, said she’s continued to support Obama because she feels he’s made progress on overhauling health care, promoting same-sex marriage and lifting the ban on gays in the military. Danner, who works part time at an African American heritage museum, said she thought Obama’s full-throated support would go a long way to persuade minorities and young Americans to show up to vote for the next Democratic nominee.

“The last eight years have been preparing for the 2016 election,” Danner said. “The current generation that voted for Obama, like myself, will probably continue the journey with the next Democratic candidate.”

In an AP-GfK poll conducted in January and February, nearly half of Americans — 47 percent — described the economy as “good,” almost as many as the 51 percent who called it “poor.” Since then, views of the economy have grown slightly more negative, with 41 percent now saying the economy is “good” and 57 percent saying it’s “poor.”

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The AP-GfK Poll of 1,004 adults was conducted online from Thursday to Monday, using a sample drawn from GfK’s probability-based KnowledgePanel, which is designed to be representative of the U.S. population. The margin of sampling error for all respondents is plus or minus 3.4 percentage points, but higher for subgroups such as Hispanics and African Americans.

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Associated Press writer Stacy A. Anderson contributed to this report.

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Reach Josh Lederman on Twitter at http://twitter.com/joshledermanAP and Emily Swanson at http://twitter.com/EL_Swan