The document talks about how charging companies for emitting greenhouse gases (GHGs) helps combat climate change by encouraging investments in cleaner technologies. By 2030, the U.S. needs $700 billion each year to shift towards a greener economy, and carbon pricing is a big part of raising these funds. Right now, the cost of emitting carbon is way lower than what's needed to meet the goals of the Paris Agreement. The report looks at different methods, like carbon taxes and emissions trading, that put a price on GHG emissions to help reduce global warming.