The Earth's atmospheric methane concentration has increased by about 150% since 1750, and it accounts for 20% of the total radiative forcing from all of the long-lived and globally mixed greenhouse gases.
A concentración do metano na atmosfera incrementouse nun 150% desde 1750, e agora supón o 20% de forzante radiativo total de todos os gases invernadeiros de vida longa e mesturados globalmente.