“Some government and business leaders are saying one thing – but doing another. Simply put, they are lying. And the results will be catastrophic.”

That sort of temperature rise would see our planet hit by “unprecedented heatwaves, terrifying storms, and widespread water shortages”.

Hence, researchers say global warming must stay below 1.5C .

Keeping temperatures down will need big changes in energy, industry, transport, consumption, and natural treatment.

To stay below 1.5C, all carbon emissions must peak by 2025 and decline quickly, reaching net-zero by mid-century.

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1.5C warming requires negative emissions or carbon dioxide reduction after 2050.

New and pricey technology makes this problematic.

Some IPCC members are skeptical about these techniques.