On the eve of U.S.-EU Summit, President Barack Obama and visiting Swedish Prime Minister Fredrik Reinfeldt discussed climate issue, which is expected to top agenda of the summit.

At a press conference after their meeting in the White House, Obama told reporters that they have a "very constructive discussion" on a range of issues, but at the top of the list was the issue of climate change.

"It's fair to say the European Union as a whole, and the world as a whole are interested in an outcome that can start moving us down the path of a sustainable economy that is not accelerating the potential catastrophe of climate change," said Obama.

Reinfeldt, whose country took over the half-year EU rotating presidency since this July, said the European Union and the United States need to "find each other in the process to meet the two degree target when it comes to Copenhagen and the time thereafter."

The United States and other major developed countries have agreed, at the G8 summit this July in Italy's L'Aquila, to support a goal of keeping the world's average temperature from rising more than two degrees Celsius.

Ahead of departing for Washington, Reinfeldt and other leaders of the EU member states have reached an agreement on the issue of climate change, forming an unified stand for negotiation at the climate change conference in Copenhagen in December.

On Tuesday, Obama, Reinfeldt will participate in the U.S.-EU Summit in Washington with President of European Commission Jose Manuel Barroso and EU High Representative for Common Foreign and Security Policy Javier Solana.

The summit, the first formal summit between the European Union and the United States for the Obama administration, will focus on climate change, the global financial crisis and some tough issues, including the war in Afghanistan and Iran's nuclear program.

Analysts here say that the summit would be an important platform for Washington and the 27-nation bloc to coordinate their positions on common challenges and to improve the transatlantic relationship.