Republican vice presidential nominee Alaska Governor Sarah Palin smiles during the U.S. vice presidential debate at Washington University in St. Louis, Missouri, Oct. 2, 2008. [Xinhua/Reuters]

Palin said she isn't one to "attribute every activity of man to the changes in the climate."

"There is something to be said also for man's activities, but also for the cyclical temperature changes on our planet," she said.

Biden disagreed, saying, "I think it is manmade. It's clearly manmade."

"If you don't understand what the cause is, you cannot come up with a solution," he added..

Palin praised the surge in Iraq and said Obama voted against funding the troops in Iraq.

"The surge and counter insurgency has worked," she said. "It would be a shame if we quit on Iraq."

Palin even said that setting a timetable to withdraw troops from Iraq, a position Obama supported, was tantamount to "a white flag of surrender in Iraq."

Biden said he and Obama will be the administration that will end the war.

"We will end the war. With John McCain there is no end to the war," he said. Thursday's debate is the only VP debate for this general election.

Palin accused Barack Obama of voting against funding for U.S. troops in combat and chastised Biden, for defending the move, "especially with your son in the National Guard" and headed for Iraq.

"John McCain voted against funding for the troops," as well, Biden countered, adding that the Republican presidential candidate had been "dead wrong on the fundamental issues relating to the conduct of the war."