evidence: What is a green party? Green political parties reflect a broader social movement seeking to reorient civilization in what supporters say are more sustainable and humane directions. Their environmental concerns began with opposition to nuclear power but have expanded to include climate change, pollution, and industrial agriculture. According to the Global Greens network, there are close to eighty full-fledged green parties. [...] For The New Republic, Emily Atkin explains how U.S. Green Party proposals for a Green New Deal became part of mainstream politics.