Every Day Is Earth Day: Evidence on the Long-Term Impact of Environmental Activism
利用1970年首个地球日当天的天气差异，研究发现恶劣天气削弱了人们对环境的支持，导致20年后空气质量下降和婴儿先天异常风险增加，揭示了志愿活动的长期效益。
We use variation in weather to study the long-term effects of activism during the original Earth Day on attitudes, environmental outcomes, and children’s health. Unusually bad weather on April 22, 1970 is associated with weaker support for the environment 10 to 20 years later, particularly among those who were school aged in 1970. Bad weather on Earth Day is also associated with higher levels of carbon monoxide in the air and greater risk of congenital abnormalities in infants born in the following decades. These results identify benefits to volunteer activity that would be impossible to identify until years after the volunteering occurs.