One of the main reasons that the Three Gorges dam was built was to prevent flooding further downstream. The need for a dam was highlighted in 1954 when people were killed as a result of flooding of the Yangtze River.
Arab Spring refers to the democratic uprisings that arose independently and spread across the Arab world in 2011. The movement originated in Tunisia in December 2010 and quickly took hold in Egypt, Libya, Syria, Yemen, Bahrain, Saudi Arabia, and Jordan.
Some observers have drawn comparisons between the Arab Spring movements and the Revolutions of 1989 (also known as the Autumn of Nations) that swept through Eastern Europe and the Second World, in terms of their scale and significance.or example, Yemen was seen as a success story of the Arab Spring but the new government was destabilised by the Houthis, a Shia rebel group, which threaten the fragile new regime. In spring 2015 the conflict in Yemen has escalated following the suicide bombings in Yemeni capital Sana'a.