That is the idea that it doesn't hurt anything to err on the side of caution. That is the lame idea that alarmists use to try and get their way when they can't win the argument. The trillions of dollars it would cost do hurt people. Millions die that are living in poverty and unnecessary greenhouse restrictions will only dramatically increase that number. One major cause of death is respiratory illness from indoor cooking fires. There is also no hot water, less sanitation, less clean water, no refrigeration for drugs .... There is a common fantasy of the movement that primitive lifestyle is more healthy.