An Act for greenhouse gas measuring and accounting truth

HD 3057 requires Massachusetts to revise how it measures and reports greenhouse gas emissions. It mandates that the state's emissions inventory use 20-year timeframes for short-lived gases (like methane) and 100-year timeframes for long-lived gases (like CO2), applying updated methods retroactively to 1990. The bill also requires the state environmental department to conduct independent, ongoing monitoring of emissions using direct measurements and publicly share the data for comparison with annual reports. This directly affects the state's environmental agency, which must now publish detailed, science-based emissions data meeting these new standards.