The biggest threat to the environment is: self-delusion and gullibility –

John Stossel: The full Judith Curry Interview: Climate Scientist Says World Won’t End.
Climate scientist Judith Curry bravely says climate change isn’t a “crisis.” She explains how the scientific community became corrupted by “fame and fortune.”

Judith Curry: President, Climate Forecast Applications Network Professor Emerita Georgia Tech Blog: Climate Etc.
Author of Climate Uncertainty & Risk