What are the key differences between a carbon tax and cap and trade system, and how do they impact the regulation of carbon emissions in the context of environmental policy?

A carbon tax is a fee imposed on the amount of carbon dioxide emitted, while a cap and trade system sets a limit on emissions and allows companies to buy and sell permits to stay within that limit. Both aim to reduce carbon emissions, but a carbon tax provides a clear price signal, while cap and trade offers flexibility in meeting targets. The choice between the two can impact the effectiveness and cost of regulating carbon emissions in environmental policy.