An increase in unusually hot and cold days is boosting US energy demand
Combined heating and cooling days,
annual % change
10%
5
0
-5
-10
1950
1970
1990
2010
Combined heating and cooling days, annual % change
10%
5
0
-5
-10%
1950
1960
1970
1980
1990
2000
2010
2018