Global warming march scheduled Sunday in Washington, D.C.

MILWAUKEE (WITI) -- They're concerned about global warming, and they're on their way to Washington D.C. to make a statement. They're calling out President Barack Obama to take executive action to address the issue.

More than 160 people from the Sierra Club, a grassroots environmental organization, plan on marching with thousands of others from the Washington Monument to the White House. One of its goals is shutting down production of an oil pipeline from Canada to the U.S.

"It's going to be the largest climate rally the largest environmental rally in the history," said Jamie Racine, who helped organized the trip from Milwaukee to Washington D.C.

"You have got to act strongly and quickly on the rhetoric that we've been hearing recently from you," said Julie Enslow. "It has to be direct action executive action and we are asking him to say no to the Keystone (XL) pipeline."

A pipeline they say will run from Alberta, Canada, across the U.S. to massive refineries in Texas.

"When it's burned will contribute tremendous amount of carbons into the atmosphere," added Enslow.

But not everybody shares this view.

'There is no global warming, there hasn`t been for 15 years," said Norm Kalmanovich, from the organization "Friends of Science." The group is made up earth and atmospheric scientists and engineers who say the climate is changing, but not from greenhouse gases.

"There`s been a decrease in cloud cover in the Earth which allows more sun to come in that`s what`s caused the warming," said Kalmanovich.

But hundreds who took the trip from Milwaukee disagree, which is why they'll be marching Sunday. Their message will also be heard in March at the Delta Airlines Center at the annual Sustainability Summit and Exposition, where speakers will be on hand to discuss issues like global warming.