* U.S., European shares rise as government bonds fall

* Oil rises above $50/bbl on Gaza, Russia-Ukraine worries

* Dollar climbs for third day versus major currencies

By Vivianne Rodrigues

NEW YORK, Jan 6 (Reuters) - Stocks rose across the globe on Tuesday, extending an advance which began last week as investors bet on a world-wide economic recovery, while political events drove oil briefly above $50 a barrel.

Technology shares led among gainers on Wall Street and the U.S. dollar extended a three-day rally versus most major currencies, particularly the euro.

The stronger dollar weighed on gold, which fell to a two-week low, while concerns about a massive pending supply of government debt needed to pay for an economic rescue pushed bond yields to their highest level in three weeks.

Investors looked past weak U.S. economic data and focused on U.S. President-elect Barack Obama's stimulus plan, which has been helping fuel a tentative recovery in the world's stock markets.

The stimulus plan may also include $310 billion in tax cuts as part of a $775 billion package.