Any fast change to the global environments is going to cause more extinctions than speciations. That is loss of diversity. Their is no minimal time for extinct

Any fast change to the global environments is going to cause more extinctions than speciations. That is loss of diversity. Their is no minimal time for extinctions, whereas the time to speciate significantly requires hundreds of thousands or millions of years. Having the climate change in conjunction with pouring plastic into the environment, the CO2 effects on ocean life, overfishing, destruction of wild land and life, chemicals leaking into the environment, etc - and the problem multiplies.