Participants of the demonstration 'G20 Protest Wave' gather in front of the city hall in Hamburg.  Picture: Markus Scholz/dpa via AP
Participants of the demonstration 'G20 Protest Wave' gather in front of the city hall in Hamburg. Picture: Markus Scholz/dpa via AP
Greenpeace activists demonstrate against the energy policy of the government while writing parts of the slogan 'End Coal' on a freighter in the harbor of Hamburg, Germany. Picture: Bodo Marks/dpa via AP
Greenpeace activists demonstrate against the energy policy of the government while writing parts of the slogan 'End Coal' on a freighter in the harbor of Hamburg, Germany. Picture: Bodo Marks/dpa via AP
People protest against the gathering of European leaders on the upcoming G-20 summit in Hamburg, Germany. Picture: Matthias Schrader/AP
People protest against the gathering of European leaders on the upcoming G-20 summit in Hamburg, Germany. Picture: Matthias Schrader/AP
People protest against the upcoming G-20 summit in Hamburg, Germany. Hamburg will host the G-20 summit on July 7 and July 8. Picture: Matthias Schrader/AP
People protest against the upcoming G-20 summit in Hamburg, Germany. Hamburg will host the G-20 summit on July 7 and July 8. Picture: Matthias Schrader/AP
Participants of the demonstration 'G20 Protest Wave' gather in Hamburg, Germany.  Picure: Markus Scholz/dpa via AP
Participants of the demonstration 'G20 Protest Wave' gather in Hamburg, Germany. Picure: Markus Scholz/dpa via AP
A woman attends a protest against the gathering of European leaders on the upcoming G-20 summit in Hamburg. Picture: Matthias Schrader/AP
A woman attends a protest against the gathering of European leaders on the upcoming G-20 summit in Hamburg. Picture: Matthias Schrader/AP
People attend a protest against the gathering of European leaders on the upcoming G-20 summit in Hamburg. Picture: Matthias Schrader/AP
People attend a protest against the gathering of European leaders on the upcoming G-20 summit in Hamburg. Picture: Matthias Schrader/AP
Greenpeace activists demonstrate against the energy policy of the government  in the harbor of Hamburg, Germany. Picture: Bodo Marks/dpa via AP
Greenpeace activists demonstrate against the energy policy of the government in the harbor of Hamburg, Germany. Picture: Bodo Marks/dpa via AP

Hamburg, Germany - Thousands of people are taking part in the first major protest in the northern German city of Hamburg before the Group of 20 meeting next weekend.

About 4 000 people marched through the city center Sunday to protest against the climate and trade policies of the world's major developed and emerging economies.

The demonstration, which also saw protesters take to the water with a flotilla of hundreds of small boats, was organized by environmental, labor, human rights and church groups.

Authorities are putting in place tight security and declaring certain areas of Hamburg off limits to protesters during the July 7-8 summit.

Chancellor Angela Merkel said in a video address Sunday that she wants discussion among leaders to include issues such as sustainable development, labor rights and environmental protection.

Associated Press