The make-or-break climate summit: here’s what’s at stake at Cop26

If leaders in Glasgow do not act to ratchet up carbon cutting, the alternative is a dialling up of calamitous global heating

Cop26 may involve dozens of world leaders, cost billions of pounds, generate reams of technical jargon and be billed as the last chance to prevent calamitous global heating, but at its simplest the climate conference in Glasgow is a debate about dialling up or dialling down risk.