Speaking by live video link, Brazil's Environment Minister Joaquim Pereira Leite said on Monday the country would cut its greenhouse gas emissions by 50 percent by 2030, compared to a previous commitment to reduce emissions by 43 percent over that period. The reductions are calculated against emissions levels in 2005. That baseline was retroactively revised down last year, making it easier for Brazil's targets to be met. Advocacy group Climate Observatory said that a 50 percent reduction was still weaker than the 43 percent commitment using the pre-Bolsonaro baseline, meaning Brazil had not in reality increased its ambition. In a pre-recorded video shown at COP26 in Glasgow, Scotland, President Jair Bolsonaro said he had authorized Pereira Leite to submit new climate targets at the summit. "We will act responsibly and search for real solutions for an urgent transition," Bolsonaro said. "I reaffirm my message to all who participate in COP26 and the Brazilian people: Brazil is part of the solution to overcome this global problem." Pereira Leite also said that Brazil would formalise a commitment to become "climate neutral" by 2050 during COP26, a promise first made by Bolsonaro in April. The Glasgow talks aim to keep alive a target of capping global warming at 1.5 degrees Celsius (2.7 Fahrenheit) above pre-industrial levels - a level scientists say would avoid its most destructive consequences. To do that, it needs more ambitious pledges from national governments. Brazil's greenhouse gas emissions rose 9.5% in 2020, a study released last week sponsored by Climate Observatory found. Deforestation, which hit a 12-year high in Brazil's Amazon rainforest in 2020, is the biggest source of Brazil's emissions.