One year ago:
So, now we know. Despite fossil fuel demand plummeting, global economy in free-fall, and gasoline demand in US (and probably worldwide) at record lows, the earth's atmospheric CO2 actually increased year-over-year. The NYT recently posited that global CO2 emissions would fall eight percent this year.
This tells me all I need to know about manmade, fossil-fuel, contribution to atmospheric CO2.