12. • Costanza et al. (1997). The value of the world's ecosystem services and natural capital. Nature, vol. 387
• Costanza et al. (2014). Changes in the global value of ecosystem services. Global Environmental Change, no. 26
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20. • We have a new global tally of the insect apocalypse. It’s alarming.
• Insect collapse: ‘We are destroying our life support systems’