Lose too many players in an eco-system, and it will stop working. Climate change is just one driver in bio-diversity loss, on land it is humans destroying habitat thru farming, mining & logging , at sea , overfishing. That's putting it simply, of course. There are only two countries in the World who are not party to the treaty " the Convention on Biological Diversity", The USA and the Vatican. It's a problem humans ignore at their peril, that seems to be the trend . From the NY Times;

Why the U.N.’s Biodiversity Conference Is So Important - The New York Times (nytimes.com)

A report on the state of the World's bio-diversity;

ipbes_global_assessment_report_summary_for_policym akers.pdf