US Carbon Emissions Up 6% In Past Two Years

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4. probably improvements in the economy

Unemployed people will often not use AC or keep the heat way down. As the economy improves more people can afford to use climate control. Even if poeple are employed but worried about their job they may cut back on use.

Factories cut back on shifts and reduce power. Maybe even shut down for a week or two to let demand catch up.

I worked at Lowes and when sales declined we eliminated our overnight crew and moved them to days.

This meant that we could turn off the ac and use almost no lighting. With sales back up the overnight may be back (I dont work there anymore).