CO2Facts.info about carbon dioxide and biogas

CO2 Calculator, reduce your emissions!

Emissions Calculator by EPA.gov
You can use the online calculator from EPA (U.S. Environment Protection Agency) to get a rough 'ballpark' estimate of your personal or family’s greenhouse gas emissions and explore the impact of taking various actions to reduce your emissions.
The calculator is broken into three sections:
Section 1: Estimate your current total household emissions.
Section 2: Actions to reduce your gas emissions, energy use, and more.
Section 3: See how much you can save by taking the actions

here you can calculate your household emissions on www.epa.gov

WWF Footprint Calculator
Worried about your impact on the environment? The way we use the planet's resources makes up our ecological footprint. The WWF-UK Footprint Calculator takes less than 5 minutes and could set you on a life-changing journey.

Search and compare the ecological footprints of different countries using the Footprint Interactive Graph based on the WWF Living Planet Report.

check your footprint on wwf.panda.org
calculate your individual footprint on wwf.panda.org