There are different solutions for the two scenarios. If humans are the main cause then reduction in CO2 emissions may suffice. While if there are other reasons

There are different solutions for the two scenarios. If humans are the main cause then reduction in CO2 emissions may suffice. While if there are other reasons then we may need to consider how to drastically increase CO2 capture methods, or look towards deliberate geoengineering, or ramp up coastal protections and work to decrease the population in low-lying areas.