The hole in the ozone layer that is growing ever larger, and the global warming that accompanies it, are both consequences of the rise in greenhouse gases.

The Kyoto Protocol of 1997 has regulated their emission. But the targets set have not been achieved thus far.

Climate change is being caused, particularly
in the industrialised countries, by the combustion of fossil fuels.

Agriculture is also making its own contribution worldwide. Here the main cause, alongside the forest clearances, is the intensive management of livestock.

The slurry and manure of farm animals produce a vast quantity of methane (CH4).