Risky.  Keep in mind that Cleantech is growing with or without a carbon tax.  The potential unintended consequence of a high carbon tax if our major trading partners do not have one, is that clean technologies are developed in the lower cost of business jurisdiction (e.g. the U.S.) and imported by Canada.  Lower personal income taxes will stimulate domestic consumption for sure, but the carbon tax would raise the cost of business and hurt many sectors (not talking oil sands, think food production).