The Ice Age will not destroy humanity, but will only increase the demand for resources and their cost, as well as the struggle for them.
Mankind does not destroy the planet, but pollutes it every day, makes the environment harmful for itself, for flora and fauna.
The problem lies in the capitalist model of behavior, in the inappropriate use of resources, including people.
Can this problem be solved by reducing consumption? No, this is contrary to capitalism.
Fair distribution is a fairy tale, everyone considers himself special and deserves more.
It remains to periodically reduce the number of consumers by wars, viruses, disasters, lgbt, infertility and etc.