evidence: Since the ambitious and controversial Green New Deal debuted last month, Republicans and Democrats have sparred over the cost of the measure — a nonbinding resolution that broadly outlines how the U.S. should address climate change over the next decade. [...] The Green New Deal, which hasn’t yet come up for a vote in either chamber, is a nonbinding resolution that calls for the country to address climate change by reaching net zero greenhouse gas emissions through a "10-year national mobilization." The proposal requires that the transition to clean energy be done in a way that is sensitive to vulnerable populations, and includes other large-scale goals, such as providing all Americans with health care, housing and economic security. [...] The Green New Deal, he said, is a set of ambitions, not policies, and how much things cost will depend on what the policies are.