It can be solved if everybody were to live in caves, eat twigs and berries, wear animal skins, walk everywhere, hunt with homemade bows and arrows.
Mankind did that for a while and, in the end, decided nice warm houses, factory-made clothes, farm-grown food and affordable horseless transportation was a better way to live.
Not really.
This climate of this planet has been in a constant state of change throughout its existence. Most of that change has occurred without any human involvement at all.
Human beings are just not all that important to the earth’s climate.