The recently released Fifth National Climate Assessment from the US government confirms an increase in extreme weather events as a direct result of climate change, despite a national decrease in US greenhouse gas emissions. The report emphasizes the urgent need for further action to avert potential nationwide catastrophe.
The urgency comes in the backdrop of a surge in extreme weather events experienced across all regions of the United States within the year. These events range from fatal wildfires in Maui to heavy rainfalls causing severe flooding in the Northeast. The report was required under the Global Change Research Act of 1990, which mandates the US Global Change Research Program to present a comprehensive report every four years, detailing the effects of global changes, both natural and human-induced, on various aspects of the environment and human activity.
According to the report, the surge in extreme weather events is “unprecedented over thousands of years.” It warns that as global greenhouse gas emissions rise, the planet could face “large-scale changes” in temperature, sea level, ocean acidification, and rainfall patterns.
As the world’s climate has shifted toward warmer conditions, the frequency and intensity of extreme cold events have declined over most of the US, while the frequency, intensity, and duration of extreme heat have increased… Many other extremes, including heavy precipitation, drought, flooding, wildfire, and hurricanes, are becoming more frequent and/or severe, with a cascade of effects in every part of the country.
The report also highlights the economic impact of these weather events, conservatively estimated to cost the US about “$150 billion each year.” The frequency of billion-dollar disasters has also increased, from one every four months to one every three weeks. These events disproportionately affect low-income communities and minorities, including indigenous tribes, who have less access to disaster relief and essential infrastructure. The report predicts that these harmful effects will only escalate in the near term, amplifying existing socioeconomic disparities and threatening water supplies, agriculture, and infrastructure systems.
The report concludes that the increase in extreme weather is “unequivocally caused by greenhouse gas emissions from human activities” and suggests several mitigation strategies. These strategies include expanding solar and wind energy, transitioning transportation systems to carbon-neutral alternatives, improving urban planning, and enhancing “efficiency of food production, distribution, and consumption.” Reforestation and the restoration of coastal ecosystems are also recommended to decrease carbon levels in the atmosphere.
Despite the dire projections, a statement from the Biden administration shines a light on its aggressive climate agenda. The administration emphasizes the reduction of US greenhouse gas emissions and has expressed its commitment to the “robust scientific findings” of the new assessment. It further announced an investment of “more than $6 billion to make communities across the country more resilient to the impacts of climate change” and aims to achieve net-zero carbon emissions by 2050.