Twenty-eight female guards were unfairly dismissed by a security company because the client‚ Metrora.
TENS of thousands of people demonstrated in the Danish capital on Saturday for speedy action by the UN climate conference to halt global warming.
On arrival at the venue in Copenhagen, they presented a list of demands to Connie Hedegaard, a Danish cabinet minister serving as president of the conference that runs until Friday.
"You are right," she told the crowd. "We have talked enough already, and now it's time to take action."
Hours earlier, police took more than 900 demonstrators into "temporary custody" after a group of troublemakers hurled stones and fireworks at officers, injuring one policeman in the face.
About 100000 climate activists from around the world took part in the protest.
Smaller solidarity demonstrations also took place in more than 100 other countries.
Former Danish supermodel Helena Christensen appealed to US president Barack Obama to lead a far-reaching pact when he arrives at the end of the week.
"The US must recognise the huge influence they have over what can happen in climate protection," she said.
Singer Angelique Kidjou from Benin in West African said: "How long do heads of state want to sit back and watch people dying because of climate change?" - Sapa-dpa