Wall Street climbs as global debt worries recede

Strong quarterly results from Alibaba as well as speculation that consumer review website Yelp.com could be for sale drove technology stocks higher, with the S&P tech index up 0.87 percent. The number of Americans filing new claims for unemployment benefits held near a 15-year low last week, suggesting positive momentum in the economy, but not so much as to change expectations for a September interest rate hike by the Federal Reserve. A recent run-up in global interest rates that has worried