I don't think your "worst possible" case is calibrated correctly.
The worst possible case is global famine and food chain collapse. Food wars, water riots. Starvation in the literal billions.
Living in a Western country won't solve the problems of "crops can't grow anymore" or "keystone species in the food chain are extinct". We'll starve and die in mass numbers just like everyone else.
Even if we had billions dead from starvation worldwide (huge if), life in a western country in 2060 will be better than life for almost anyone born in 1800 anywhere on earth.
The worst possible case is global famine and food chain collapse. Food wars, water riots. Starvation in the literal billions.
Living in a Western country won't solve the problems of "crops can't grow anymore" or "keystone species in the food chain are extinct". We'll starve and die in mass numbers just like everyone else.