Press TV: Around one thousand environmental activists have held a demonstration in Poland to call on world leaders to address the issue of climate change, media reports say.
On Saturday, the campaigners marched in central Warsaw, which currently hosts a two-week UN climate conference.
People from around the world took part in the event that was organized by Poland's small Green Party.
Demonstrators were holding banners reading, "Social justice and positive energy for everyone", Heat up your brain,...