Scientists say the United States needs to do more. It must stop adding carbon dioxide to the atmosphere by 2050, which the bill won’t achieve. That is the target all major economies must meet to constrain average global temperature rise to 1.5 degrees Celsius, or 2.7 degrees Fahrenheit, above preindustrial levels, scientists say. Beyond that threshold, the likelihood increases significantly of catastrophic droughts, floods, wildfires and heat waves. The planet has already warmed an average of about 1.1 degrees Celsius.
It’s like losing 20 pounds when you need to lose 100 pounds,” said Robert McNally, the president of Rapidan Energy Group, an energy consulting firm. “And this won’t get you there.”