I believe the reasoning is that climate change will destabilise regions leading to world conflict.<p>The major destabilisation will come from resource shift, such as water scarcity/abundance, leading to land conflict leading to major players (US/Russia/China/Europe) posturing.<p>It may seem like 'serious inconvenience' but if Europe suddenly had it's gas supply cut off by Russia and diplomacy failed do you not think they would mobilise their army BEFORE the eastern European winter arrives? The same would be true if water were scarce.<p>The dependencies between major blocks of our species are changing and climate change will strain relations.