They are thinking of combining the idea of a carbon tax with the gas tax. Almost like the idea I was conjuring up last summer. See my blog entry from August. This bill isn't the same as my idea, but it's surprisingly close. Called the Forward Washington Transportation Plan introduced by state Senator Steve Hobbs, D-Lake Stevens.
There's a need to raise money for Washington's roads and other transportation systems. Much of the need is environmental. US Supreme Court has recently ruled that our state must take out a lot of culverts under roads. Widen river crossings under many roads to enhance salmon habitat and maybe save the whales.
Carbon tax and the gas tax are sort of like cousins.
Follow above link to my blog entry from last August with a somewhat similar line of thinking.