According to that recent terrifying UN report, avoiding the most catastrophic consequences of global warming requires reducing 2010-level greenhouse gas emissions by 45 percent by 2030, and 100 percent by 2050. Ocasio-Cortez's proposal is even more ambitious, aiming for the complete decarbonization of the American economy, including the energy production sector, within 10 years. To that end, she wants a House select committee to study the issue, hear from experts, investigate potential interventions, and then distill their findings into a concrete plan by January 1, 2020. And unlike previous big-picture climate change initiatives that have gone exactly nowhere, this committee would also be required to author an honest-to-God bill—something on which the House and Senate could vote—no more than 90 days after that.
Source : https://www.gq.com/story/green-new-deal-explainer