The B.C. Liberal Party is employing an unusual tactic, apparently in the hopes of splitting the green vote on Vancouver Island.

The party took out a full-page ad in the Friday edition of a local newspaper comparing Green Party Leader Jane Sterk, NDP Leader Adrian Dix and Liberal Leader Christy Clark.

The ad asks who is strong enough to stand up for B.C., and says Sterk has clear environmental views, while Dix and the NDP are flip-flopping over the expansion of the Kinder Morgan pipeline.

The ad also points to Clark's five-point position on oil pipelines including environmental assessments and benefits for First Nations and the province.

Dix, meanwhile, will spend the day treading over some well-worn election ground on Vancouver Island. The NDP holds seven of the 11 seats there, but the area is also fertile territory for Green Party votes.

Dix started the day in the Oak Bay-Gordon Head riding currently held by Liberal Ida Chong and where climate scientist Andrew Weaver is running for the Greens in what's considered a three-way race.