Think20 (T20) bụ nyocha na ndụmọdụ ndụmọdụ amụma maka G20 - ọgbakọ maka nkwado akụ na ụba mba ụwa nke mejupụtara 19 nke nnukwu akụ na ụba ụwa na European Union. Ọnụ, ndị isi ụwa na-eche echiche tankị na-akwalite mmepụta amụma iji nyere ndị isi G20 aka idozi nsogbu ịma aka zuru ụwa ọnụ ma na-achọ obodo na-adigide, na-agụnye, na-agbanwe agbanwe.

N'ikiri ụkwụ nke G20's Third Environment and Climate Sustainability Working Group, Onye isi ala anyị Mark J. Spalding bụ onye edemede na nso nso a amụma T20 nke isiokwu ya bụ "Ịmepụta ego maka mgbanwe akụ na ụba na-acha anụnụ anụnụ". Nkenkenke a na-enye ndụmọdụ maka otu G20 nwere ike isi wepụta ego maka mgbanwe mgbanwe akụ na ụba Blue.