Before revision: One criticism of the assumption that the idea of the world getting worse is a cognitive bias is that it follows from the assumption that any idea of global warming being bad should be dismissed as "cognitively biased", since the climate was less globally warmed in the past and will be more globally warmed in the URL
After revision: One criticism of the assumption that the idea of the world getting worse is a cognitive bias is that it follows from the assumption that any idea of global warming being bad should be dismissed as "cognitively biased", since the climate was less globally warmed in the past and will be more globally warmed in the future.