JAKARTA, Indonesia — Secretary of State John Kerry, calling climate change perhaps the world's most fearsome weapon of mass destruction, urged developing nations on Sunday to do more to cut greenhouse-gas emissions as he derided climate-change skeptics at home and blamed big companies for hijacking the debate.
Kerry painted a picture of looming drought and famine, massive floods and deadly storms as a result of global warming, and he urged ordinary citizens in developing nations to speak out on the issue and demand more from their political leaders. He labeled those who denied the evidence of climate change as "shoddy scientists and extreme ideologues."
He was addressing a group of students and government officials at an American cultural center in the Indonesian capital, Jakarta, in a country and region that he said were "on the front lines of climate change" and thus most vulnerable to the effects of global warming. "It's not an exaggeration to say that the entire way of life here is at risk," he said.
Global efforts to counter climate change have long foundered on a sharp divide between developed and developing nations. Although developing nations now account for more than half of greenhouse-gas emissions, they have been reluctant to commit to meaningful cuts as they seek a path to Western industrialization and prosperity. They argue the West caused the problem and should fix it.
But Kerry, who has spent much of his political career calling for more action on the issue, said that every country needed to play a role in cleaner energy or the world would face a calamitous future, calling climate change "perhaps the world's most fearsome weapon of mass destruction."
"It's absolutely true that industrialized countries have to play a leading role in reducing emissions, but that doesn't mean other nations have the right to repeat the mistakes of the past. It's not enough for one country or even a few countries to reduce emissions when other countries continue to fill the atmosphere with carbon pollution as they see fit," he said.
"If even one or two major economies neglects to respond to this threat, it will counteract all of the good work that the rest of the world does. When I say we need a global solution, I mean we need a global solution."
China and the United States are the world's largest sources of greenhouse-gas emissions, accounting for about 40 percent. Indonesia, a country of about 240 million people, is in the top 10 sources of carbon emissions globally, largely as a result of deforestation, and is also a major coal exporter. But like many developing nations, Indonesia, an archipelago of some 17,000 islands, has a lot to lose from global warming.
Kerry said scientists predicted that melting ice caps could push sea levels up by more than 3 feet by the end of the century, putting half of Jakarta underwater and displacing hundreds of millions of people worldwide.
Changes in ocean temperatures and acidification of the seas could also reduce fish catches in Indonesia by as much as 40 percent, he said, while typhoons such as the one that struck the Philippines last year could become the norm and "wipe out entire communities."
There was still time to act to address the problem, but the window was closing, Kerry said. The problem was not finding a scientific solution, but a lack of political resolve.
A similar call to arms in a speech in India last year failed to have any impact, but Kerry said he would be telling U.S. diplomats all over the world to make climate change a priority from now on.
Kerry spent a considerable portion of his speech spelling out the scientific consensus behind climate change, which he said was almost as conclusive as the gravity that caused an apple to fall from a tree or the laws of thermodynamics that meant your hand would burn when touching a hot stove.
"We simply don't have time to let a few loud interest groups hijack the climate conversation," he said, blaming big companies that "don't want to change and spend a lot of money" to stop people acting to reduce the risks.
"First and foremost, we should not allow a tiny minority of shoddy scientists and extreme ideologues to compete with scientific facts," Kerry told the audience. "Nor should we allow any room for those who think that the costs associated with doing the right thing outweigh the benefits."