Figure 2.
The four heatmaps are arranged in 2 rows. Each x-axis spans approximately 1980 to 2020, with labelled ticks at 1980, 1990, 2000, 2010, and 2020. Each y-axis is Period, extending from about 1 at the top to about 11 at the bottom, with labelled ticks at 4 and 8. The Natural Resource, N A R, panel contains an outlined region mainly between about 2002 and 2015 and periods 1 to 4. The Clean Energy Transition, C L T, panel contains an outlined region extending approximately from 1990 to 2012 and periods 1 to 7, narrowing around period 4. The Eco Innovation, E C I, panel contains an outlined region concentrated from about 1982 to 1989 and periods 1 to 6, with an additional faint outlined area near the left edge. The Net Adjusted Saving, A N S, panel contains an outlined region around approximately 1984 to 1992 and periods 2 to 4, plus smaller faint outlined regions near periods 4 to 7. Curved boundary lines form broad V-shaped limits across all 4 panels.WPS of NAR, CLT, ECI and ANS