Is Climate Change Intensifying Flooding?

Storm Bert led to widespread disruption across numerous regions of the country at the close of last month. This raises questions about whether an increase in storms and worsening flooding can be attributed to climate change. The direct response is “yes,” though additional factors warrant further examination. The underlying physics of climate change is, in many respects, straightforward. Human activities consistently generate gases such as carbon dioxide, which contribute to the warming of our planet’s climate. A consequence of a warmer climate is heightened water evaporation and increased atmospheric energy. During winter, this manifests as more frequent storms capable of depositing significantly larger volumes of rain rapidly over confined areas. Conversely, summers become hotter and drier. These phenomena are directly connected to nearly every human activity. This ranges from individual actions, such as air travel for leisure or driving for errands, to the operations of large-scale fossil fuel corporations globally. However, can Storm Bert be definitively linked to an exacerbation by climate change? Are instances of flooding and damage becoming more prevalent than in the past? To understand the situation, an examination of recent events is necessary. Satellite imagery of Storm Bert depicted an elongated cloud formation stretching across the country, poised to release substantial rainfall over a relatively confined region. This phenomenon is termed an “atmospheric river,” accurately describing a concentrated stream of water vapor in the atmosphere. Bert manifested as a slow-moving weather front that evolved into an area of exceptionally heavy precipitation, persisting for up to 36 hours in certain locations. This type of intense, severe rainfall is precisely what is anticipated to become more frequent due to climate change. Typically, it is common to state that a specific storm, such as Bert, aligns with the patterns expected from a warming planet, yet it remains challenging to attribute any single weather event solely to climate change itself. Nevertheless, over the past few years, scientists have significantly improved their ability to determine the extent to which a storm or weather catastrophe is attributable to climate change. Researchers characterized floods in Colombia this month as being “mostly exacerbated by human-driven climate change.” Similarly, events in Valencia, Spain, have been reported as “mostly strengthened by human-driven climate change.” While direct research concerning Bert has not yet been released, the indicators are unequivocal: climate change is a primary factor. Nonetheless, several other human elements contribute to this narrative. Initial weather forecasts may have underestimated the intensity of the impending rainfall, leading to subsequent upgrades of some rain and flood warnings. Additionally, the collapse of a flood wall in Tenbury Wells, Worcestershire, resulted in inundation for residents and businesses typically spared from such events. These observations also highlight challenging realities regarding climate change and its consequences. Flood defenses do not offer a complete solution to flooding risks; they necessitate ongoing maintenance and are still susceptible to failure. Structures erected as prudent safeguards in the 1990s might now be insufficient. Certain areas may never be appropriate for flood defenses, and occasionally, these climate change-fueled storms will deposit water in unforeseen locations. Yet, the most striking reality concerning Storm Bert’s impact is that, despite it aligning precisely with climate change projections, the majority of individuals persist in taking flights, driving vehicles, and conducting global commerce as usual. Even as the global climate change conference COP29 concluded amidst profound disagreements, the necessary actions to definitively address climate change appear to remain unattainable. This occurs even as the consequences begin to manifest in our lives. For further updates, follow BBC Hereford & Worcester on BBC Sounds, Facebook, X, and Instagram. Copyright 2024 BBC. All rights reserved. The BBC disclaims responsibility for the content of external websites. Information regarding our external linking policy is available for review.