The statement that best captures how thawing permafrost changes Earth’s physical geography is: "Thawing permafrost leads to the creation of lakes and swamps where there were none."
This statement highlights a significant physical change in the landscape due to the melting of permafrost, which alters hydrology and landforms, leading to the formation of new water bodies. The other statements, while they may reflect ecological changes or impacts on wildlife, do not specifically address the physical alterations in geography as markedly as the creation of lakes and swamps does.