Nation California wildfires wiped out nearly 20 years of greenhouse gas emission reductions – in 2020, alone October 18, 2022Elizabeth Weise, USA TODAYComments Off on California wildfires wiped out nearly 20 years of greenhouse gas emission reductions – in 2020, alone California's 2020 wildfires produced twice as much greenhouse gas emissions as the state's reductions in such pollutants since 2003, a new study says.