Nepal's Rasuwa flood request tests a UN loss and damage fund built around scheduled windows

The hardest part of the Rasuwa case is scientific. In a comment in Nature, an environmental scientist who has studied change in the Himalayas for more than 20 years describes how disasters like this one unfold as a chain ^[17][13]. A slope fails. The failure sets off an avalanche of rock and ice, the ice melts into a debris flow that picks up sediment, and the flow floods valleys downstream ^[13]. Each link carries its own uncertainty about how much climate change caused or intensified it ^[13].

Several factors shaped both the odds of the disaster and the damage it did, according to the comment: how long-term warming had altered the ice, how much sediment moved with the water, where downstream flooding occurred, and how exposed and prepared communities were ^[19]. Separating the warming contribution from the rest is the job of attribution science.

The fund needs that evidence and cannot wait for it. In a highly competitive funding environment it needs credible evidence of climate influence to protect its mandate, the author wrote, yet robust attribution of complex cascading disasters takes time ^[20][14]. The fund has also not set out how climate's role would count in a funding decision at all ^[9].

The author's answer is to split the decision by speed ^[11]. An emergency allocation would come first, covering urgent humanitarian work and essential services, decided on a streamlined assessment of need and vulnerability ^[11]. Reconstruction and long-term recovery money would follow within a few years, after a fuller assessment ^[11]. For the first stage, the author argues, established evidence already shows global warming played a part in the risk of this disaster ^[12].

In my view the split is sound, provided the second stage has a rule for cascades whose attribution comes back weak or ambiguous. It separates a fast judgement about need from a slow one about cause ^[11]. On the ambiguous cases, the author cites Coumou and colleagues in PNAS Nexus in 2024 and argues that a lack of formal evidence must not be read as meaning climate played no part, and must not justify denying support ^[16].

The burden of proof would fall unevenly. Attribution needs plentiful data, modelling infrastructure and access to experts, and the author wrote that countries such as Nepal cannot be expected to have them ^[15]. Nepal has contributed 0.01% of global carbon emissions ^[10]. A rebuild of almost $5 billion at roughly 10% of GDP implies an economy of about $50 billion ^[1].

The fund was set up in 2022, and one of its main roles is to provide finance quickly for humanitarian action in emergencies ^[7]. Its reasons for the pace on Nepal are not on the record beyond its initial reply, and the account of the delay comes from the comment ^[5][6]. "Rasuwa must set a precedent for future emergencies," the author wrote ^[18].