How much is carbon trading worth?

Can you provide me with an overview of the value of carbon trading? I'm particularly interested in understanding the monetary significance of this market and how it relates to the broader financial and environmental landscape. Are there any key factors that drive the worth of carbon trading, and how do these factors fluctuate over time? Additionally, I'd like to know if there are any projections for the future growth or decline of this market, and what impact this may have on both the environment and the global economy.