The problem is really not just global heating, but the pollution, CO2, loss of wild life, trees - the lungs of this planet. Also the variability of the climate is very detrimental for the vegetation https://youtu.be/Q_m_0UPOzuI?t=131

And I think, before governments set a global plan, people should already change their own behaviors: consume way less, drive less, travel way less (above all when it's 'just' for vacation), stopping to have pets (pet industry is quite large, so quite polluting, and they provide no benefits to the ecosystem, unlike wild animals, even if it's not significant compared to human consumption, it's worth) and so on

We are actually still in an ice age, although currently in a warming period known as an interglacial. All of human civilization has occurred in our present ice age.

The ice age will end when the large ice sheets still covering land are gone. That's mostly Greenland. At which point the world will be a total mess.