{WGII SPM D.1, WGII SPM D.1.1, 
WGII SPM D.4, WGII SPM D.4.3, WGII SPM D.5.1; WGIII SPM D.1.1} 
The cumulative scientiﬁc evidence is unequivocal: climate change 
is a threat to human well-being and planetary health (very 
high conﬁdence). Any further delay in concerted anticipatory 
global action on adaptation and mitigation will miss a brief and 
rapidly closing window of opportunity to secure a liveable and 
sustainable future for all (very high conﬁdence). Opportunities for 
near-term action are assessed in the following section. {WGII SPM D.5.3; 
WGIII SPM D.1.1}