Germany must update its climate law by the end of next year to set out how it will bring carbon emissions down nearly to zero by 2050, its top court ruled on Thursday.
Speaking at a summit of world leaders, Bolsonaro's pledge would move up the previous target for reaching net zero emissions by 10 years.
He repeated a commitment made last week to end illegal deforestation by 2030, adding that it would reduce the country's greenhouse gas emissions by roughly 50% by that date.