*Major climate changes inevitable and irreversible.*

*Only rapid and drastic reductions in greenhouse gases in this decade can prevent such climate breakdown, with every fraction of a degree of further heating likely to compound the accelerating effects.*

The IPCC presents seven possible scenarios for future development of the Earth's climate.

It also says that cutting methane emissions must be the immediate priority.

That means emissions from cows, and from the extraction and transmission of natural gas.