Before revision:  We show that CO_2 emissions are lower than levels expected in the absence of COVID-19 for each month from March through July 2020 but that those monthly reductions are not statistically significant considering hypothesis tests at 5\% significance levels.
After revision:  We show that CO_2 emissions are lower than levels expected in the absence of COVID-19 for each month from March through July 2020 considering hypothesis tests at 5\% significance levels.