NATO’s goal is protecting NATO territory from invasion. Given that the Russian Army is currently getting pulverized in Ukraine, that leaves Estonia, Latvia, Lithuania, Poland and Finland safer.
"NATO’s 2023 Climate Change and Security Impact Assessment demonstrates how extreme weather conditions create operational stress and shorten the life cycles of military equipment, generating additional maintenance and replacement costs. The assessment, which builds on findings from the first 2022 edition, focuses on four geographical regions (Europe, North America, the Middle East and North Africa/the Sahel, and the High North), and four of NATO’s operational domains. It uses three specific case studies to underpin its recommendations on adapting to a climate changed future operating environment: the impact of extreme heat on NATO Mission Iraq; the effects of rising sea levels and storms on Norfolk Naval Station in the US; and those of flooding on the Naval Air Station in Sigonella, Italy."
Source: "NATO steps up work on climate change and security 12 Jul. 2023"
URL: https://www.nato.int/cps/en/natohq/news_217212.htm