It's not really about immediate pros and cons. The Paris accords don't actually hold nations to any sort of immediate reduction in CO2 emissions. They call fo

It's not really about immediate pros and cons. The Paris accords don't actually hold nations to any sort of immediate reduction in CO2 emissions. They call for nations to start reducing their emissions in 2020, and progress to a final target in about half a century. Obama's pledge wasn't to even be realised until 2025. Most nations are implementing various carbon taxes in an attempt to reduce emissions, the obvious is that no carbon tax means no additional tax on businesses and transportation. This could be considered an upside. Downside? Who knows, the US never really implemented anything anyway, so practically nothing will change. Ultimately, potential issues will be global warming on a catastrophic level. Then again, that may happen with or without the US attempting to reduce emissions.