Climate change is a shift in long-term weather patterns influenced by fossil fuel combustion and other activities that increase atmospheric concentrations of greenhouse gases. Learn more.

Global Warming Solutions Act (GWSA) Implementation

In August 2008, Massachusetts became one of the first states in the nation to move forward with a comprehensive regulatory program to address climate change.

Greenhouse Gas (GHG) Emissions in Massachusetts

Learn about statewide levels in 1990, projections for 2020 without additional restrictions, and required reporting of facility emissions data to guide state target-setting and progress measurement.

Reducing Greenhouse Gas Emissions

Find out what Massachusetts is doing - and what you can do - to cut down on air pollution that contributes to climate change.

Massachusetts Greenhouse Gas Emissions Reporting Program

Reporting of greenhouse gas emissions provides data that is important for developing emission reduction targets and plans, and for measuring progress toward goals.

Progress Toward Massachusetts Clean Energy & Climate Goals

Massachusetts is proof that striving for reductions in greenhouse gas emissions doesn't hinder economic progress.

How to Get Involved

Contribute your ideas to state greenhouse gas policy discussions and take steps to reduce your personal, household and community carbon footprints.

Reduce Your Carbon Footprint at Home

Ten simple steps you can take to lower your personal and household emissions of carbon dioxide, the leading contributor to climate change.

Climate Change Laws & Regulations

Learn about the Global Warming Solutions Act (GWSA), greenhouse gas (GHG) credits and trading, the Massachusetts GHG Emissions Reporting Program, and other state initiatives.