An analysis of U.S. cities shows more than half are having one of their 5 hottest years on record.
Food that ends up in landfills emits methane, a strong greenhouse gas.
The cool days of late November will turn warmer on average in the coming decades.
Halloween weather can be highly variable depending on the year.
Sea level rise is causing more coastal flooding in the U.S. See how many floods have a human fingerprint in these cities.
Later frosts mean longer growing seasons for the U.S.
This is how much the average frost-free season has changed since 1970.
The decrease in cool nights is one feature of an overall fall warming trend.