At issue the Houthis' motivations. Is their anti-ship campaign deliberately intended to cause environmental damage, or is this collateral harm?

Their indiscriminate selection of targets suggests the former even if they do weaponise the environment https://agsiw.org/from-navigational-disruptors-to-ecocriminals-the-environmental-impact-of-the-houthi-anti-shipping-campaign-in-the-red-sea #Yemen