The warning signals of climate change that have hit people around the world in the last few months must be heeded by national governments at key meetings later this year, political leaders and policy experts are urging, as the disruption from record-breaking weather continues in many regions.

Extreme weather events have struck around the world – from the drought and record temperatures in northern Europe, to forest fires in the US, to heatwaves and drought in China, to an unusually strong monsoon that has devastated large areas of southern India.

As the northern hemisphere summer…