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.
The Earth First! movement in the United Kingdom started in 1990, when a group in Hastings, Sussex organised an action at Dungeness nuclear power station in Kent. It grew rapidly, and many groups formed, with or without the EF! name, over the next years.