British Prime Minister Gordon Brown (file photo)

World leaders at the United Nations General Assembly in New York are calling for an international response to unprecedented global crises, including turmoil in financial markets, skyrocketing food and fuel prices, and global warming.

During Friday's fourth day of speeches, British Prime Minister Gordon Brown said the world's problems cannot be resolved unless nations act together.  He also called for urgent action to stabilize world financial markets and for new international "colleges" to oversee markets in the future.

Palestinian Authority President Mahmoud Abbas Friday told the assembly he is committed to peace with Israel, but warned partial or interim solutions will undermine the peace process.  

Mr. Abbas said a peace deal must include a just solution to the status of Palestinian refugees, and a Palestinian state alongside Israel based on the 1967 borders.

The annual, week-long General Assembly session gives world leaders the chance to highlight their countries' concerns and accomplishments to other U.N. members.

Nepal's Prime Minister Pushpa Kamal Dahal, known as Prachanda, called for help in lifting that new republic out of poverty.

Jamaican Prime Minister Bruce Golding said the world will benefit if wealthy nations invest in developing countries.

The prime minister of Bhutan, Jigme Thinley, blamed much of the world's problems on societies dictated by consumerism and what he called "insatiable greed."