WASHINGTON: President Barack Obama in an interview aired Sunday said all signs point to the US economy starting to grow again but there may not be enough new jobs created until next year.

US President Barack Obama speaks during a rally on healthcare at the Comcast Center in College Park, Maryland, on September 17. [Agencies]

"And we're probably not going to start seeing enough job creation to deal with the -- a rising population -- until some time next year," Obama said, adding that 150,000 additional jobs must be added each month just to keep pace with population growth.

Federal Reserve Chairman Ben Bernanke said on September 15 that the worst US recession since the Great Depression of the 1930s was probably over but the recovery would be slow and it would take time to create new jobs.

In signs the US economy is recovering, retail sales rose at the fastest pace in 3-1/2 years in August and a gauge of New York state manufacturing activity hit a nearly two-year high.

Obama has sought in recent weeks to highlight the signs of an improving economy in an effort to boost his popularity, which has suffered amid a heated debate over his plan to overhaul the nation's healthcare system.

But he said the financial markets were working again and manufacturing had even ticked up, in terms of production, last month. "So all the signs are that the economy's going to start growing again," he said.

Obama is going to Pittsburgh during the week to host the Group of 20 leaders of the biggest industrialized and developing economies.

"That's part of what the G20 meeting in Pittsburgh is going to be about, making sure that there's a more balanced economy," he said.

"We can't go back to the era where the Chinese or the Germans or other countries just are selling everything to us, we're taking out a bunch of credit card debt or home equity loans, but we're not selling anything to them," he said.

But several hundred protesters who gathered Sunday in Pittsburgh before the G20 meeting said they would demand that global leaders do more to create jobs for the growing number of unemployed in the United States and around the world.

"(This) is a jobless recovery and there is the prospect of a permanent high unemployment economy unless a jobs program is enacted," Larry Holmes, of protest organizers Bail Out the People Movement, told Reuters.

A march in the largely black Pittsburgh neighborhood called the Hill District began near what protesters called a "tent city" of unemployed and homeless who traveled there to have their voices heard.

Sara Vanwyk, 27, a marketing manager for a medical device company who flew in from Tampa, Florida, said, "We're spending billions on wars in Iraq and Afghanistan yet people are living homeless on the streets."