[cnn-photo-caption image= http://i2.cdn.turner.com/cnn/2008/images/12/25/art.oil.gi.jpg caption="President Obama expects a climate change bill to face an extremely close vote in the House of Representatives."]WASHINGTON (CNN) - President Barack Obama acknowledged Thursday that a climate change bill strongly backed by the White House will face an extremely close vote in the House of Representatives as early as the end of the week.
He made an urgent plea for congressional approval in what could be an early make-or-break test of his young administration.
"Now is the time for us to lead," Obama said during an appearance in the White House Rose Garden. "We cannot be afraid of the future. We cannot be prisoners to the past."
The president said the bill will spark a "clean energy transformation" of the U.S. economy and "make possible the creation of millions of new jobs."
"Make no mistake," he emphasized. "This is a jobs bill."
The climate-change bill currently being debated by the House would reduce nationwide greenhouse gas emissions 17 percent by 2020 and 83 percent by 2050 through a so-called "cap-and-trade" program.
The bill's future also remains unclear in the Senate, where leaders are holding off on advancing their own version of the legislation until it clears the House.