"We have that problem in Bolivia. It is not an internal problem, it is an external problem," Morales told a news conference after delivering a speech during a meeting on indigenous people and climate change at the UN

Morales said that during a recent conference on energy issues, he disagreed with "some South American presidents who were talking about biofuels but did not understand what they were talking about."

"This is very serious," he said. "Cars come first, not human beings. But, for us, how important is life and how important are cars? So I say life first and cars second."

In his UN speech earlier, Morales called on the International Monetary Fund and the World Bank to develop policies to curb the use of biofuels "in order to avoid hunger and misery among our people."

Morales did not name the South American presidents he was criticizing.

But his views are in sharp contrast to those of Brazilian President Luiz Inacio Lula da Silva, who says developing countries have enough land to produce both food and biofuels.

DOWNPLAYING THE "SEPARATISTS"

Morales' visit to the United Nations came as he appears to be trying to win international support for his fight against opposition leaders of four eastern provinces who want significant autonomy from the central government.

Morales had no plans for meetings with officials or diplomats from other countries. But aides said he would give several interviews to foreign reporters in New York.

Morales' aides also distributed what they described as a "memorandum" addressing the political situation in Bolivia.

The document calls the opposition group a "mostly white, powerful and wealthy separatist movement" and accuses it of preparing an "illegal" referendum on autonomy to be held on May 4 in order to destabilize the elected government and resist Morales' push to rewrite the constitution.

"This resistance comes from some groups, some families which do not want to lose their privileges," the president told the news conference.

He played down the significance of the separatist movement, however, saying its referendum will not matter because it is illegal.