tax the products and services of nations refusing to reduce climate emissions

Why should this not be done? I can't think of a reason why those countries which refuse to commit to reduce their carbon emissions shouldn't be effectively taxed on any and all products and services they trade internationally. The revenue would be used to reduce emissions unilaterally by the climate-change-preventing nations. I know there are trade barriers to such things and the WTO will have an apoplectic fit at the prospect but then fuck them.

I thought this was such a great idea that I emailed Caroline Lucas to share it with her. She rules. Literally, she does! She's an MEP!