This is a straw man. The arguments against humanity’s survival are not technological, but economic: we will not survive because our economic systems continue to poison the environment, to the detriment of all. Solutions exist, but because it is taken as a matter of faith that economics is more important than environmental impact, no technological solutions are implemented. Capitalists fight almost literally to the death to maintain the status quo of a fossil fuel driven society, and has shown no ability to change in ways needed to stave of doom.