clipped from news.bbc.co.uk

US President Barack Obama used his first UN address to urge world unity

In his first speech to the UN General Assembly, he said global problems included nuclear proliferation, war, climate change and economic crisis.

Libyan leader Muammar Gaddafi berated the UN Security Council, while French President Nicolas Sarkozy issued a stern warning to Iran

Mahmoud Ahmadinejad, who has previously said he does not believe the Holocaust happened, was due to speak later on Wednesday.

Israel has called for a boycott of his appearance and the Germans have said they will walk out if he repeats the claim.

"Those who used to chastise America for acting alone in the world cannot now stand by and wait for America to solve the world's problems alone," he said.

MARDELL'S AMERICA Obama's speech to the United Nations was a reminder of the scale of his ambition and the intractability of the problems before him Mark Mardell BBC North America editor Read Mark's thoughts in full