Carbon credits aren’t necessarily a bad idea. It basically sets a hard limit for the amount of carbon that can be produced, and the ability to produce can be sold. Now, the way it should be handled is every person is provided with a certain amount of credit, and they can sell them and make money off of them, bargain with them, or just choose not to give them up reducing the amount of carbon that is allowed to be produced. It should be up to the people.
Some amount of carbon will always be released. It should be handled in the way that best benefits the people, not the capitalists. Carbon credits may be part of that solution, but not in the form they usually take.