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The 2000s was a decade of the Gregorian calendar that began on January 1, 2000, and ended on December 31, 2009.
The growth of the Internet contributed to globalization during the decade, which allowed faster communication among people around the world.
The economic growth of the 2000s had considerable social, environmental and mass extinction consequences, raised demand for diminishing energy resources, and was still vulnerable, as demonstrated by the financial crisis of 2007–08.
In the English-speaking world, a name for the decade was never universally accepted in the same manner as for decades such as the '80s, the '90s, etc. Orthographically, the decade can be written as the "2000s" or the "'00s". Common suggestions for referring to this decade: "2000s", "Two-thousands", "Twenty Hundreds", "Twenty-ohs", "00s" (pronounced "Ohs", "Oh Ohs", "Double Ohs" or "Ooze"), the "Zeros", "the Aughts", "the Noughties", "the Aughties", "the Oughties". When the "20–" is dropped, the individual years within the decade are usually referred to as starting with an "oh", such as "oh-seven" to refer to the year 2007. During the 2000s decade, it was more common to hear years referred to starting with "two-thousand (and)" rather than "twenty-oh". Starting around the middle of the 2010s, it is becoming more common to refer to the individual years of the decade as "twenty-oh-seven" or "twenty-oh-eight" than it had been during the 2000s, although the "two thousand (and)" pattern is still dominant.
The War on Terror and War in Afghanistan began after the September 11 attacks in 2001. The International Criminal Court was formed in 2002. A United States-led coalition invaded Iraq, and the Iraq War led to the end of Saddam Hussein's rule as Iraqi President and the Ba'ath Party in Iraq. Al-Qaeda and affiliated Islamist militant groups performed terrorist acts throughout the decade. These acts included the 2004 Madrid train bombings, 7/7 London bombings in 2005, and the Mumbai attacks related to al-Qaeda in 2008. The European Union expanded its sanctions amid Iran's failure to comply with its transparency obligations under the Nuclear Non-Proliferation Treaty and United Nations resolutions.