Are the policies of the United States adequate in addressing climate change? Explain

The Clean Power Plan, a federal policy introduced under President Obama, aims to combat climate change by limiting emissions from the energy sector. Several policy instruments can help put a price on GHG emissions: carbon or energy taxes, the removal of environmentally harmful subsidies, tradable permit schemes and the project-based flexibility mechanisms of the Kyoto Protocol to the United Nations Framework Convention on Climate Change (UNFCCC). In the US, Americans started burning fossil fuels at higher rates than the rest of the world early, which means that the US is responsible for almost a third of the excess CO2 that's already in the atmosphere, despite having just more than 4% of the global population.