Canadian Natural Resources Minister Joe Oliver on Monday decried a European Union proposal to rank Canadian oil sands as a more polluting fuel than conventional oil.

TORONTO (Reuters) - Canada warned on Sunday it will "defend its interests" if the European Union (EU) goes through with a proposal to rank Canadian oil sands as a highly polluting fuel.

BRUSSELS (Reuters) - The government of Alberta, home to the bulk of Canada's oil sands, has written to EU experts voicing "grave concerns" that the bloc's plans to rank unconventional oil as a highly polluting fuel are unfair and a potential threat to trade ties.

Buying its way to shale technology . Sinopec?s (NYSE: SHI, Stock Forum) move to purchase Calgary-based Daylight Energy (TSX: T.DAY, Stock Forum) and its 300,000 acres of oil and gas-rich land for $2.2 billion certainly wasn?t the first Canadian acquisition by a Chinese oil and gas company ? and it won?t be the last.

WASHINGTON/CALGARY (Reuters) - U.S. lawmakers will urge Secretary of State Hillary Clinton on Friday to reject the proposed route of the Keystone XL oil sands pipeline, saying they are concerned the approval process has been tainted by alleged conflicts of interest.

Opposition to Canada's oil sands will only intensify unless Ottawa takes strong action on climate change, said a Canadian official cited by local media Wednesday.

Environmental activists Friends of the Earth Friday called on US President Barack Obama to overturn a controversial $7 billion oil pipeline project to run from Canada to the United States.

WASHINGTON (Reuters) - Environmental groups sued the U.S. government on Wednesday to stop "illegal construction" on a controversial pipeline that would weave through the center of the United States to bring Canadian oil sands crude direct to Texas refineries.

WASHINGTON (Reuters) - Green groups sued the U.S. government on Wednesday to stop the clearing of grasslands and other work on a pipeline to bring Canadian oil sands crude to Texas, opposed by environmentalists for the petroleum's high greenhouse gas emissions.

Key gaps in information mean Canada has been unable to assess the impact of exploiting Alberta's oil sands, the nation's environment commissioner said Tuesday.

* Says Canada wasting billions on climate change plan

Growth of hydro and other renewables is projected to rise 2.7 percent annually through 2035 . You might think this is going to be another article about natural gas, oil shale, or the tar sands.

The State Department on Monday denied claims of "complicity" with a firm building a $7 billion US-Canada oil pipeline, made by an environmentalist group that released emails it said showed bias.

WASHINGTON (Reuters) - As Washington edges closer to deciding the fate of a pipeline to bring crude from Canada's oil sands to Texas, emails between the company's lobbyist and the State Department show a cozy relationship that indicates a U.S. bias toward the project, an environmental group says.

Former human rights lawyer Alison Redford was picked Sunday to be the next premier of Canada's Alberta province, which is battling environmentalists opposed to the expansion of its oil sands.

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CALGARY, Alberta (Reuters) - Canada's energy regulator said on Wednesday it is looking into a complaint that TransCanada Corp's permit to build the Keystone XL oil pipeline within its own borders has expired, adding the prospect of more delays to a project environmentalists hope to block.

Eight Nobel peace laureates on Wednesday urged Canadian Prime Minister Stephen Harper in an open letter to halt the expansion of the Alberta oil sands.

PORT ARTHUR, Texas (Reuters) - Supporters outnumbered critics at a government-sponsored hearing on the proposed TransCanada Corp's Keystone XL pipeline that would ship oil from Canada to the Texas Gulf Coast.

More than 100 demonstrators were arrested Monday for storming the Canadian parliament to protest Ottawa's support for a proposed pipeline to bring oil from Canada's tar sands to the US Gulf Coast.