Huge gains in Asia and a strong open in Europe followed an overnight surge on Wall Street and extended last month's rebound amid tentative signs of stabilization in the hard-hit global economy and banking industry.
In European morning trading, Britain's FTSE 100 rose 3 percent to 4,072.46, Germany's DAX surged 4.6 percent to 4,310.82 and France's CAC 40 jumped 4 percent to 2,951.75.
"There's some renewed optimism around the G-20 meeting today and the possibility there might be something structured coming out of it," said Richard Hunter, analyst at Hargreaves Lansdown Stockbrokers.
President Barack Obama and the summit host, British Prime Minister Gordon Brown, have expressed confidence that world leaders will come up with a strong agreement to address financial regulation, growth, and troubled banks. But French President Nicolas Sarkozy and German Chancellor Angela Merkel have refused calls for more government spending, and said the meeting must take concrete steps on tougher financial regulation.
Investors in Europe were also awaiting a key interest rate decision from the European Central Bank at 1145 GMT. The bank is expected to cut its benchmark interest rate by a quarter or a half percentage point to a record low as more grim economic news emerges from the euro zone, the 16 countries that share the euro.
With many economists predicting the bank won't cut further after Thursday, interest will focus on what President Jean-Claude Trichet says about other measures it could take if the economy needs more of a push.
In Europe and Asia, financial and auto stocks charged higher after U.S. home sales, manufacturing and auto data suggested the U.S. recession may be moving closer to a bottom.
Car makers BMW, DaimlerChrysler and Renault jumped 9.6 percent, 9.1 percent and 8 percent, and tire maker Michelin added 10.9 percent. In Asia, Toyota Motor Corp. and Nissan Motor Co. strengthened 5.5 percent and 14 percent on U.S. auto figures that were less dismal than feared. Investors were encouraged after U.S. car sales jumped by nearly 25 percent last month from February, beating the typical rise and underpinning hopes of a turnaround in the American auto market.
A rebound in pending U.S. home sales in February from a record low, as well as improving manufacturing activity, added to a growing belief the most severe global downturn in decades may be moving close to a bottom.
Still, the upbeat evidence distracted investors from more sobering news that the U.S. private sector continued to shed hundreds of thousands of jobs last month - a worrisome sign as investors brace for Friday's report on nationwide job cuts.
With the economic crisis still far from over, analysts warned of more painful market volatility as the recession unfolds.
"We're starting to see some initial signs of green shoots. The question is whether or not this is a sound foundation for stability in the economy," said Song Seng Wun, head of research at CIMB-GK in Singapore. "It's still hard to tell."
Wall Street was expected to open higher. Dow Jones Industrial Average futures were up 126 points at 7,844 and Standard & Poor's 500 futures gained 14.4 to 823.60.
In Asia, Japan's Nikkei 225 stock average jumped 367.87 points, or 4.4 percent, to 8,719.78, while Hong Kong's Hang Seng led the region's gains, soaring 1,002.43 points, or 7.4 percent, to 14,521.97. South Korea's Kospi added 3.5 percent to 1,276.97.
Elsewhere, benchmarks in Australia and Taiwan gained about 3 percent. Singapore jumped 5.3 percent and India's Sensex climbed 4.9 percent.
Sentiment got a lift from overnight gains on Wall Street. The Dow rose 152.68, or 2 percent, to 7,761.60, and broader market indicators also rose. The Standard & Poor's 500 index rose 13.21, or 1.7 percent, to 811.08.
Oil rose above $50 a barrel in Europe as investors weighed glimmers of hope in the U.S. economy against concerns that global demand remains weak. Benchmark crude for May delivery rose $2.47 to $50.86 a barrel. The contract fell $1.27 on Wednesday to settle at $48.39.