Page 64 - Materials Chemistry, Second Edition

5 LCA and Sustainability 47

Fig. 5.1 Planetary boundaries. a Illustrates the concept of thresholds and boundaries in relation to
an ecosystem’s response to increasing human pressure. b Shows the proposed nine boundaries
(two of them subdivided for specific pressures) and that mankind has currently exceeded four of
them, two beyond the zone of uncertainty (Steffen et al. 2015a). Reprinted with permission from
AAAS