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On 26 August 2026, a rock-ice avalanche at Langtang Lirung (5,150 m asl) triggered a massive debris flood that travelled 200 km into India, causing over 1,300 deaths and widespread destruction in Nepal. The event released energy equivalent to a M5.5 earthquake and moved at average speeds of 188 km/hr. While geological structure was the primary control, the report finds that human-caused climate change significantly increased the likelihood and intensity of the anomalous warmth preceding the failure. Specifically, temperatures in July and August were approximately 1.5°C higher due to climate change, contributing to permafrost degradation, glacial thinning, and a shift in the rain-snow transition. The report concludes that the magnitude and speed of the event exceeded the limits of existing early warning systems and adaptation measures, necessitating a focus on loss and damage recovery.

The document is a transcript of a congressional briefing on West Coast coastal resilience. Experts from the USGS, California coastal agencies, and the Puget Sound region discuss the physical drivers of sea level rise, the vulnerability of critical infrastructure, and various adaptation strategies. Key discussions include the 'coastal squeeze' effect on beaches, the use of nature-based 'soft shore' stabilization in Washington, and the implementation of regional planning and environmental justice policies in the San Francisco Bay Area.