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DES MOINES — Promising more than a half-billion solar panels by the end of a first term and an ambitious target of clean energy for every home in America in a decade, Hillary Rodham Clinton unveiled goals on Sunday evening to reduce the threat of climate change.

She said she would continue President Obama’s sweeping plan to limit carbon emissions from power plants, and announced targets that even push beyond current goal’s for greenhouse gases.

Mr. Obama’s proposed regulations are expected to be finalized by the Environmental Protection Agency in August, and the real work of making the changes — shutting down coal plans and increasing the number of renewable electricity sources — would fall to the next administration.

The Clinton campaign said the goals, set out on its website in a video, were the first of a six-plank plan to address climate change that Mrs. Clinton would continue to unveil in coming weeks and months.

Other areas of focus will be improving the efficiency of buildings, ensuring that fossil fuel production is “safe and responsible,’’ and protecting financial markets from climate-related risks.

In the video and at an earlier event, Mrs. Clinton said that critics of taking strong action, who include most of the Republican presidential candidates, were ignoring the seriousness of the threat.

“Those people on the other side, they will answer any question about climate change by saying, ‘I’m not a scientist,’’’ Mrs. Clinton said in Ames, Iowa, on Sunday. “Well I’m not a scientist either. I’m just a grandmother with two eyes and a brain.’’

Mrs. Clinton also promised to help any workers who lose their jobs as coal plants respond to Mr. Obama’s plan to limit carbon emissions. Appalachia, once a bastion of Democratic support, has been hostile to Mr. Obama for what officials like Senator Mitch McConnell of Kentucky, the Republican majority leader, call a “war on coal.”

“I will be very clear, I want to do more to help in coal country,’’ Mrs. Clinton said at the event. She expressed gratitude to men “who mined the coal that created industrial revolution that turned on the lights that fueled the factories, who lost their lives, who were grievously injured, who developed black lung disease.’’

Mrs. Clinton’s pledge to produce “enough renewable energy to power every American home within 10 years of taking office’’ — that is, by 2027 — is even more ambitious than Mr. Obama’s plan.

The president has pledged to get the United States to produce 20 percent of electricity from renewable sources by 2030 — essentially tripling renewable power from today.

Mrs. Clinton’s plan would arrive at 33 percent, said Heather Zichal, who served as Mr. Obama’s senior climate change adviser until last year.

“I think this initial statement from her is a strong signal that she’s committed to a thoughtful policy that pushes the envelope,’’ she said.

Mrs. Clinton’s rollout of a climate plan, the latest in a series of policy agendas, was in part intended to counter the threat on her left from Bernie Sanders, the Vermont senator who draws thunderous cheers at rallies when he calls for the immediate action on the warming climate. And unlike Mr. Sanders, Mrs. Clinton has not clearly stated whether she opposes building the Keystone XL pipeline, which has become the leading rallying cry of grass-roots environmentalists.

On Friday, Tom Steyer, the billionaire climate activist, said that in order to receive his backing and financial support, a candidate would have to pledge to enact an energy policy that would lead to the generation of half the nation’s electricity from renewable or zero-carbon sources by 2030, and 100 percent by 2050.

Martin O’Malley, the former governor of Maryland who is also seeking the Democratic nomination, has already put forth such a plan.

In a statment, Mr. Steyer praised Mrs. Clinton’s proposal without offering explicit financial support. “Today, Hillary Clinton emerged as a strong leader in solving the climate crisis and ensuring our country’s economic security,” he said.