negotiate establishment of a carbon tax in return for approving the Keystone pipeline

Some say Keystone pipeline should not be approved because it will increase carbon emissions. Some say it won't increase carbon emissions significantly. It is certain that disapproving it will not solve our carbon emission poblem. But a carbon tax will harness the power of free enterprise to solve global warming. Therefore, use the political desire to approve Keystone to obtain the true solution. Negotiate with Congress to enact a carbon tax in return for approving Keystone.