Just ahead of a major global economic summit, President Barack Obama called for international allies to develop more aggressive steps to jump-start their own economies. Obama told reporters after a White House meeting on Wednesday with Treasury Secretary Timothy Geithner that efforts to pull the US economy out of recession will falter without global coordination. "We can do a really good job here at home, with a whole host of policies, but if you continue to see deterioration in the world economy, that's going to set us back," Obama said. Geithner is headed to Britain this week for talks with the finance ministers of 20 advanced and developing nations. Those meetings are a precursor to a leaders' summit on April 2 on the global financial crisis that is taking place in London early next month.