Use the values in the table to plot a more recent amendment to the Montreal Protocol: the Beijing Protocol of 1999. To do this, drag the curved purple line onto the graph; then use the diamonds from the purple line and the data from the table to plot the three points sequentially. Beijing 1999 1980 2000 2020 2040 2060 2080 2100 15 12 9 6 3 0 Stratospheric chlorine emissions (parts per billion) Year No protocol Montreal 1987 London 1990 Zero emissions Based on 2008 UNEP / GRID-Arendal. Compare the Montreal (blue curve), London (orange curve), and Beijing (purple curve) protocols. Which protocol is the least aggressive at decreasing stratospheric chlorine emissions? 1999 Beijing Protocol 1990 London Protocol 1987 Montreal Protocol