From watt I know have emission trading been a good ting in US. But if so it is trade inside one country. A global trade involving several counties with different type of industry and economy may give a different result. The economical science has not convinced they can make proper predictions of the consequences from economical/political actions.
Cap and trade may be a good idea but it can have severe unwanted consequences, special for the poor people in the world. It’s important to be observant for these negative effects.
At the moment I think its political impossible with a global carbon tax
