Thousands of forestry workers from across Canada demonstrate in Ottawa on Tuesday. (CBC)

Thousands of unionized forestry workers from across Canada demonstrated in Ottawa on Tuesday, demanding the government do more to support their industry.

They wanted to meet with Prime Minister Stephen Harper to discuss solutions to the forestry crisis, including protection of workers' pensions and a plan to keep viable mills operating with the help of federal government loan guarantees and other measures.

"The reason we're here is the forestry industry has taken an awful downfall in northern Ontario," Joseph Lefebvre, a pipe-fitter with AbitibiBowater in Iroquois Falls told CBC News. "We want the Harper government to get off their butts and do something about it."

In the past six years, the industry has lost about 130,000 jobs in Canada.

"Our main demand has always been for the federal government to backstop loans so that viable companies can keep operating, saving jobs and communities," Dave Coles, a spokesman with the Communications, Energy and Paperworkers Union of Canada, which represents most of the workers, said in a release. "We are not asking for a bailout."

The issue came up in question period, sparking a heated exchange between government ministers and opposition parties.

Bloc Leader Gilles Duceppe accused the government of offering "crumbs" to the forestry industry in Quebec while throwing out billions for Ontario's auto industry. He said the government supported GM, because it would cause the loss of thousands of spinoff jobs and crush communities dependent on the automaker, which Duceppe said was exactly the same situation the forestry industry faces.

NDP Leader Jack Layton called on the government to create a strategy for the forestry sector. "What we need is some fair trade for a change. What we need is to stop raw logs from going across the border and creating jobs down there in the states," said Layton.

Prime Minister Stephen Harper replied that the forestry sector is struggling because of changes in the market and a dramatic decline in demand for lumber in the United States.

The government, he said, has taken action by offering assistance to help laid-off workers and communities, as well as increasing financing for the sector through the Business Development Bank of Canada.

He also hit back at opposition parties for refusing to support the 2006 softwood lumber agreement with the U.S.

Workers from as far away as British Columbia and the east coast took part in the protest, which kicked off at Natural Resources Minister Lisa Raitt's office and wound through the city to the prime minister's office.