In order to avoid the really catastrophic scenarios, the goal is to get to zero CO2 emissions by 2050, not to reduce it as much as possible as quickly as possible. To do that, we need to be selling only pure EVs by ~2040 at the latest, hybrids will never get there unless we have a massive breakthrough in synthetic fuel.

The CO2 emission cost that goes into producing the battery is typically wildly overstated, it doesn't take very long to be recouped.