US President Barack Obama has urged lawmakers to pass a historic global warming bill amid down-to-the-wire campaigning on the eve of a tense voting session in the House of Representatives, writes AFP.

“I know this is going to be a close vote, in part because of the misinformation out there that suggests that there is somehow a contradiction between investing in clean energy and our economic growth,” Obama said.

The House was due to take up the bill today with Democratic backers and Republicans battling for the 218 votes needed to ensure passage of the bill.

Former US vice-president turned global warming campaigner Al Gore scrapped a planned visit to the Capitol to woo hesitant lawmakers and instead was reaching out by telephone from his home base in Tennessee, writes AFP.