Project Moses aims to construct giant steel gates across inlets through which the Adriatic flows into Venice's lagoon.
Concerns about Islamist threat have influenced traditionally pro-Arab Europe's view of the Israeli-Palestinian conflict.
Fueled by the recession, the groups have won members and seats in recent elections.
Italian Prime Minister Silvio Berlusconi (r.) and his foreign minister, Franco Frattini, spoke to the media Wednesday at an EU environmental conference in Brussels.
Italy is using state of emergency powers, while Spain has introduced measures that include paying jobless immigrants to go home.
Despite earlier tensions over Tibet, French President Nicolas Sarkozy will attend the opening ceremonies in August.