Premier Christy Clark is calling British Columbia's proposed liquefied natural-gas plants worldwide pollution-fighting machines, despite concerns by climate scientists and environmental groups that they will belch millions of tonnes of harmful greenhouse gas emissions into the sky.

Clark says B.C. should sell natural gas in China and Japan because natural gas is cleaner than China's coal and safer than Japan's nuclear power.

"We are doing the world a favour," she said.

But she warns timing is crucial to reach multi-billion-dollar deals with gas companies in China and Japan, and B.C.'s preoccupation with meeting its own pollution laws could impair the push to cash in on LNG developments.

Environmental group Clean Energy Canada estimates B.C.'s LNG plants could emit one tonne of GHG pollution for every one tonne of LNG they produce.

Clark came close to rejecting outright B.C.'s 2007 Greenhouse Gas Reduction Targets law that calls on the province to cut its GHG emissions by one-third by 2020.

Instead her government is expected to simply tweak the legislation to make sure the industry complies with the rules.

"I have never been an advocate of this view that the world's air begins and ends at B.C.'s borders. It doesn't."

Clark said British Columbians can decide to support an industry that could create 100,000 jobs or start debates that place road blocks to what she calls an economic opportunity that could transform the province.

"In terms of our GHG emissions, we can either decide that we want to get to yes or we are going to throw up barriers in the way of that that will ensure we don't have a natural gas industry in B.C.," she said.

Clark made the comments at a Vancouver news conference on Tuesday where a joint Chinese-Japanese energy company announced plans to build an LNG plant at Grassy Narrows, which is near Prince Rupert, B.C.

The proponents of the Aurora LNG initiative are Nexen Energy ULC, a wholly owned subsidiary of China's CNOOC Limited, and its joint-venture partners, Japan's INPEX Corporation and JGC Corporation.

Clark has repeatedly said LNG development represents a trillion-dollar windfall that could eventually raise enough revenues to pay off the provincial debt, currently at more than $60 billion.

Greenhouse gas issues remain

But NDP Opposition Leader Adrian Dix says the premier is missing the point.

"You can do as many celebratory press conferences as you'd like. It doesn't change the fact that you still have to address the greenhouse gas issues."

Dix says the province needs to find a way to balance both the potential from LNG with the need to safeguard the environment.        

B.C. Environment Minister Mary Polak has suggested the province is considering permitting LNG companies to buy carbon credits to offset the GHG emissions associated with the projects.

The money raised from the carbon credit purchases is often invested in environmentally friendly initiatives associated with the industry, but the purchase of credits allows companies to continue their emission rates at the LNG facilities.

But New Democrat energy critic John Horgan says the government is engaging in wishful thinking if they believe B.C. can get credit for fighting air pollution by selling natural gas to Asia.

He said there are currently no international bodies that grant pollution credits to jurisdictions that sell their products to other jurisdictions.

Horgan said he's also concerned Clark is moving to restrict debate about the merits of LNG development.

"There's too much cheerleading going on," he said.

With files from the CBC's Stephen Smart