A new U.S. draft report on climate change was publisized yesterday, a lead ahead of the  expected unveiling of a compromise U.S. Senate bill that aims to curb greenhouse gas emissions.

The report, a draft of the Fifth U.S. Climate Action Report that will be sent to the United Nations, says bluntly: “Global warming is unequivocal and primarily human-induced … Global temperature has increased over the past 50 years. This observed increase is due primarily to human-induced emissions of heat-trapping gases.”

The State Department report said that climate change is a reality the world is feeling – with warming air and oceans, signs of instability in the ice sheets of Greenland and Antarctica and rising sea levels. It also said emissions will continue to dramatically rise unless curbing measures are adopted.

The State Department draft precedes the expected April 26 unveiling of Senate legislation by Democrat John Kerry, Republican Lindsey Graham and Independent Joe Lieberman. The Senate bill is expected to put a price on carbon across multiple sectors of the economy, while also expanding domestic oil, gas and nuclear power production.

U.S. news reports say senior White House aides have been gearing up behind the scenes for the Senate debate by meeting with all sides of the energy debate. Environmental leaders and other key administration allies are being consulted to map out strategy on the Senate bill.

The administration’s top staffer on energy and climate issues is said to be meeting with U.S. Chamber of Commerce President Tom Donohue as part of the administration’s ongoing courtship of the nation’s largest industry voice. The Chamber has opposed action on climate change; it opposed the climate change bill passed by the House last year.

The Washington Post said multiple sources familiar with the meetings feel that the White House wants to push the Senate bill this July.