Hawaiian Countdown

The good news is that the Earth's carbon dioxide levels are being carefully monitored in the pristine (relatively) observatory of Moana Loa mountain on Hawaii's big island (https://www.theguardian.com/environment/2019/jun/04/latest-data-shows-steep-rises-in-co2-for-seventh-year). The bad news is that the observed current steep annual rise suggests we will get more quickly than was expected to the concentration where the planet's average temperature rise exceeds the 2 degrees Centigrade (safe?) figure. Before this point, scientists believe the effects become irreversible.