Nature is able to adapt and opportunistically take advantage of what it finds.
When I pick up litter in certain places of Hilly Fields in Colchester I check and remove snails which have used the litter as a home. I recognise that although humanity increasingly encroaches upon plant and animal, nature adapts to live, grow and reproduce. The ducks, pigeons and squirrels of Colchester Castle Park use humans as a food source. Colchester Castle for hundreds of years has been a home for bees and pigeons, a wild tree grows on the Castle roof. My neighbour has bats in their roof, and a fox enters their cat flap to raid the cat food. Plastic munching bacteria love the islands of plastic humanity dumped in the oceans. The Daily Mail newspaper ran an article about abandoned buildings in Finland now home to otters, squirrels, foxes, voles, badgers and other wildlife.
Even if human civilisation collapses there exists a group of humans from North Sentinel Island who DNA suggests are 60,000 years old and are likely to continue to exist in their insular ecosystem as they have done for tens of thousands of years. The Sentinelese are now a protected people who are hostile to outsiders they will kill on sight, quite rightly as any contact with modern humans will subject them to diseases they have no immunity to, as well as to exploitation. The Sentinelese are a hunter gatherer people in harmony with nature. It is hunter gatherers who are likely to adapt faster to global collapse than modern humans since they already have the tools and skills to cope with working with nature, rather than against nature.