Before his speech Obama canceled a ceremonial meeting with the Danish PM for an emergency climate meeting.

Copenhagen, Denmark (CNN) – Delegates at the U.N. Climate Change Conference are "running short on time" to reach agreement on a deal, U.S. President Barack Obama told them Friday.

"There is no time to waste," he said. "Now I believe it's the time for the nations and the people of the world to come behind a common purpose. We are ready to get this done today, but there has to be movement on all sides."

Obama sounded impatient with the progress of the two-week conference so far, saying the scope of climate change discussions over the years have produced little more than talk.

"These international discussions have essentially taken place now for almost two decades, and we have very little to show for it other than an increased acceleration of the climate change phenomenon," Obama said. "The time for talk is over." Read the full story »

Transcript of Obama's remarks | Obama: 'We can act boldly'

Editor’s note: Arctic explorer Eric Larsen is trying to make it to the North and South Poles and the summit of Mount Everest in 365 days as part of an effort to raise awareness about climate change. Larsen joined us on American Morning before he set out on his Save the Poles expedition. Below is an excerpt from his online journal.

Larsen’s crew skiing across Antarctica. Courtesy: Eric Larsen, Save the Poles..

By Eric Larsen
From EricLarsenExplore.com

On Tuesday, the Center for Biological Diversity's Climate Law Institute released a report demonstrating that President Obama has clear legal authority to commit the United States to reducing greenhouse gas pollution.

The report, titled “Yes, He Can: President Obama's Power to Make an International Climate Commitment Without Waiting for Congress”, concludes that the President need not wait for Congress to act before taking strong action to reduce U.S. emissions.

The report was released at an event hosted by Greenpeace at the conference site. The take away: President Obama's hands are not tied by Congress's lack of action or the grossly inadequate cap-and-trade bills currently under debate. President Obama can lead, rather than follow, by using his power under the Clean Air Act and other laws to achieve deep and rapid greenhouse emissions reductions from major polluters. The Constitution and existing domestic environmental laws give President Obama all the power he needs to join with other nations in making a real commitment to solve the climate crisis.

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A groundbreaking climate change summit is underway in Copenhagen, Denmark. President Obama will be there next week. In preparation, he spoke with former Vice President Al Gore who has been sounding the alarm about global warming for years.

The former vice president and Nobel Peace Prize winner is the author of a new book called, "Our Choice: A plan to solve the climate crisis." He joined us for an exclusive interview on American Morning Wednesday.

Former Vice President Al Gore answers your climate change questions on American Morning Wednesday.

By John Roberts, CNN

The intersection of the Copenhagen Climate Summit and the e-mail controversy colloquially known as “Climate-Gate” has cast new suspicion on what many people had taken to be decided science.

How much of an impact it will be remains to be seen. Professor Peter Liss, who has taken over as interim director of the prestigious Climatic Research Unit, says it is bound to have some impact, particularly among nations who are looking for reasons to resist the call for new curbs on greenhouse gases.

Supporters of anthropogenic global warming will no doubt get a boost from Nobel Laureate Al Gore, who will be attending the conference. Gore’s visit coincides with the release of his new book, “Our Choice,” in which he lays out in simple, but lengthy detail the green technologies he believes can reshape America and the world.

While Gore has legions of supporters, he also has his fair share of critics, who charge that the book is “emotionally charged propaganda” and that Gore – the venture capitalist – stands to profit handsomely from the very technology and policy he promotes.

The former vice president joins us tomorrow in the 7am hour of American Morning, and we’d like to throw open the discussion to you. What would you like to ask him about global warming, the environment and green technology?

Post your question below, call our show hotline at 1-877-MY-AM-FIX, or send us an iReport.

We’d really appreciate you being part of the discussion.

The White House and the Environmental Protection Agency are taking on critics of climate change. The EPA says greenhouse gases threaten the public health and safety of every American, and the announcement could pave the way for future regulation. Our Jim Acosta has the report from Washington.

Related: Climate chief dismisses e-mail outrage

The e-mails and allegations that the global warming threat may be exaggerated could have a major impact on climate change negotiations in Copenhagen this week.

Ground zero for the climate scandal has been Britain's University of East Anglia. Our John Roberts went directly to the source to dig deeper on this story.

Related: Key global climate talks begin in Copenhagen

Editor’s note: Arctic explorer Eric Larsen is trying to make it to the North and South Poles and the summit of Mount Everest in 365 days as part of an effort to raise awareness about climate change. Larsen joined us on American Morning before he set out on his Save the Poles expedition. Below is an excerpt from his online journal.

The plane Larsen flew in to Antarctica. Courtesy: Eric Larsen, Save the Poles.

By Eric Larsen
From EricLarsenExplore.com

None of us could believe our luck at the warm (relatively) weather and blue skies. So perfect were the conditions that we were more worried about sunburn than frostbite.

Antarctica! The place where my dreams have lived for so long. From our small temporary outpost nestled close to the Patriot Hills themselves all I can see is ice and sky. To feel important here is to simply ignore the vastness and grandure of this place. This is truly one of the last great frozen places left on the planet.

Being here now, I realize, I must double my efforts. This snowscape is so delicate. No longer immutable to change Antarctica, faces a dire fate unless we act now to reduce carbon emissions.

My fate is equally tied to this place for the next two months. What will I learn? How will I change? Right now there is still too much work to do before flying to our starting point at Hercules Inlet to be philosophical. TIA – this is Antarctica.

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Program Note: Watch the full interview with Harrison Ford on CNN's "Your $$$$$," Saturday at 1 p.m. and Sunday at 3 p.m ET.

He didn't bring a bullwhip or a fedora, but Harrison Ford brought his star power to a cause close to his heart: climate change.

Actor and activist Harrison Ford speaks with Christine Romans about climate change.

Ford joined the president of Guyana and executives of Starbucks, SC Johnson, Wal-Mart, Harrah's, Wrigley, Conservation International and others to launch Team Earth, a "global sustainability movement."

Think of it as the companies, environmentalists and politicians together trying to outrun the massive rolling boulder that is climate change.

"You have to create a movement," Ford told me, after a Team Earth press conference in Manhattan. "Like the civil rights movement, like the anti-war movement, like the youth movement of the 60's. If we can come together as an efficient mass, the issues will be addressed."

Ford is particularly concerned about deforestation and notes that more than 20 percent of greenhouse gas emissions are because of destruction of the rainforests.

• Watch Ford discuss the role of corporations

Ford spoke on the eve of a climate change summit at the United Nations, where the presidents of the two largest greenhouse gas emitters – the U.S. and China – will address the world on the issue. In Pittsburgh later this week, leaders will negotiate a framework for addressing climate change ahead of a critical summit in Copenhagen in December.

It's a lot of politics and process and, well, talking. Environmentalists like Ford are trying to seize on the momentum heading to Copenhagen.

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